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The first truly significant Big Ten game of 2013 is in the books, and Ohio State, thanks to the return of quarterback Braxton Miller and a stout run defense, found a way to prevail. As a reward, the Buckeyes remain atop the Big Ten power rankings heading into another showdown this week at Northwestern.

It's not much consolation to Wisconsin or its fans, but there might not be a better two-loss team in the FBS than the Badgers, who displayed a lot of fight in Columbus even after top running back Melvin Gordon injured his knee. We've been more impressed with Wisconsin than 4-0 Michigan or 3-1 Nebraska, so we're keeping the Badgers in the No. 3 hole for now.

Iowa makes a major move up the rankings after its impressive win in Minneapolis, while the Gophers take a tumble.

Half of the Big Ten spent Saturday on the couch, so there wasn't much movement in the power rankings.

One last look at last week's rankings.

And away we go ...

1. Ohio State (5-0, 1-0 Big Ten; last week: 1): Welcome back, Mr. Miller. The Ohio State quarterback returned to the field with a bang Saturday night, firing four touchdown passes and completing 17 of 25. Carlos Hyde also seemingly has reclaimed his place atop the running back depth chart, and Ohio State's young defense took a step against Wisconsin's power run game Saturday night. The Buckeyes now must figure out how to replace standout safety Christian Bryant as they face another test this week at Northwestern.

2. Northwestern (4-0, last week: 2): After two uninspiring performances against weak competition, Northwestern knows it must elevate its play significantly against Ohio State in what will be the most anticipated game of the Pat Fitzgerald era. Expect running back Venric Mark to return against the Buckeyes, as Northwestern will need its zone-read game to be in top form to keep pace with Ohio State on the scoreboard.

3. Wisconsin (3-2, 1-1; last week: 3): Credit the Badgers for a strong effort in Columbus despite a shaky start, a disastrous end to the first half and the loss of running back Melvin Gordon to a knee injury. But Wisconsin once again came up just short on the road. Despite another single-digit loss, Wisconsin can take away some positives from Columbus, namely the play of quarterback Joel Stave and wide receiver Jared Abbrederis. But the Badgers, who are off this week, will need some help if they want to return to Indianapolis.

4. Michigan (4-0, last week: 4): No team needed the off week more than Michigan, which had plenty to clean up following near disasters against Akron and Connecticut. Quarterback Devin Gardner's decision-making skills will be under the microscope against Minnesota, and the Wolverines' line play also will be in the spotlight against a Gophers team that has improved up front.

5. Nebraska (3-1, last week: 5): No one wants to hear Bo Pelini talk about execution anymore. It's time for Nebraska's defense to show some improvement, or it will be a long Big Ten season in Lincoln. After an open week, the Blackshirts will face a good test from Nathan Scheelhaase and an Illinois offense that doesn't resemble the unit we saw last season. Quarterback Taylor Martinez's health will be an interesting story line this week.

6: Iowa (4-1, 1-0; last week: 9): We knew Iowa was an improved team, but we needed a little more validation. Kirk Ferentz's crew provided it Saturday with a dominant performance against Minnesota to ruin its rival's homecoming. The offense is significantly better behind quarterback Jake Rudock and running back Mark Weisman, and an opportunistic defense shut down Minnesota's run game and controlled the line of scrimmage. Iowa is minutes away from being undefeated and returns home to play Michigan State with a bunch of momentum.

7. Michigan State (3-1, last week: 7): The Spartans had a familiar to-do list during their open week -- fix the offense. Coach Mark Dantonio is sticking with Connor Cook as his starting quarterback, but Dantonio clearly wants to see more plays made from the signal-caller. Michigan State's offensive line can build off its performance at Notre Dame, but the Spartans need some chunk plays.

8. Penn State (3-1, last week: 8): Bill O'Brien once again has the offense moving, as the Nittany Lions' run game looks strong and freshman quarterback Christian Hackenberg is performing beyond his years. The bigger questions remain on defense, as Penn State rebounded against a woeful Kent State offense but must show it can contain more explosive attacks. The good news is we'll find out as Penn State opens Big Ten play against four strong offenses, starting this week at Indiana.

9. Illinois (3-1, last week: 10): Here come the Illini. The biggest surprise in the Big Ten completed nonleague play at 3-1 and heads to Nebraska with a lot of confidence, particularly on offense. Scheelhaase takes aim at a vulnerable Huskers defense after firing five first-half touchdown passes and finishing with 278 pass yards on 19-of-24. The big question now is, can he follow it up against a major-conference team after struggling against Washington? Illinois already has exceeded last year's wins total.

10. Minnesota (4-1, last week: 6): The Gophers take a tumble after a horrendous performance on homecoming against Iowa. It seems like Minnesota was a product of a weak nonleague schedule, as some of the small problems that surfaced against weaker competition became big problems against Iowa, which dominated the Gophers at the line of scrimmage. Quarterback Philip Nelson struggled mightily and didn't get much help from the run game. After Mitch Leidner provided a spark in Week 4, it will be interesting to see what Jerry Kill does at quarterback going forward.

11. Indiana (2-2, last week: 11): A regrouping week was in order for Indiana after nearly nothing went right against Missouri. Quarterback Nate Sudfeld must rebound from his first real brush with adversity (three interceptions). Indiana's defense faces another balanced attack in Penn State after failing to stop Missouri on the ground or through the air. After sluggish starts in both of its losses, IU needs a strong first quarter against the Lions.

12. Purdue (1-4, 0-1; last week: 12): The misery continues for Darrell Hazell's crew, but there's a reason to watch the Boilers for the rest of the season. The Danny Etling era is underway, as Hazell opted to burn the quarterback's redshirt after Rob Henry continued to struggle. Etling showed some promise in Purdue's loss to Northern Illinois, as the offense racked up 524 yards. An open week comes at a good time for the beleaguered Boilers and their young quarterback.

Five lessons from four games in Week 5. Got that?

Let's go ...

1. Ohio State's young defense is growing up: Lost amid the Braxton Miller-Kenny Guiton debate this week was the fact a mostly young Ohio State defense with only one returning starter in the front seven would be put to the test by Melvin Gordon, James White and the formidable Wisconsin run game. The young Bucks certainly earned a passing grade after holding Wisconsin to just 104 yards on 27 carries. Gordon's knee injury limited the Badgers, but Ohio State prevented big runs and forced Wisconsin to win the game through the air. Linebacker Ryan Shazier shined, while linebacker Curtis Grant and lineman Michael Bennett both recorded sacks. The loss of safety Christian Bryant to a season-ending ankle injury is a big blow, but Ohio State has enough talent in the secondary to make up for it, as long as they don't run into Jared Abbrederis again soon. Ohio State's offense will win plenty of games, but you know what they say about defenses and championship. These might not be the typical Silver Bullets, but they're developing and can build on Saturday's performance as they face an even another formidable offense in Northwestern next week.

2. Wisconsin is an excellent 56-minute team: Gary Andersen's crew showed plenty of grit Saturday night in Columbus. Quarterback Joel Stave quieted some of his critics -- thanks in large part to a career performance from Abbrederis (10 catches, 207 yards, 1 TD) -- and linebacker Chris Borland was brilliant, as usual. But Wisconsin's inability to finish off halves remains a troubling trend, and it surfaced in the loss to Ohio State. The Badgers trailed by only three points when freshman cornerback Sojourn Shelton dropped an easy interception near the goal line. Miller found Philly Brown for a 40-yard touchdown on the next play, giving Ohio State a huge boost with one second left in the half. Wisconsin struggled to manage the clock down the stretch as its comeback attempt fell short. This isn't a team built to come back in games based on the pass game, and it showed. Coupled with the Arizona State debacle (granted, more officiating than execution), Wisconsin has had a lot of bad things happen at critical moments. That's what could separate the Badgers from a fourth consecutive Big Ten title.

3. Iowa will be a factor in the Legends Division: The Hawkeyes might not be a great team yet, but it's clear they are vastly improved from last season. On Saturday, Iowa went into Minnesota and pushed the Gophers around on their home turf, piling up 464 total yards and allowing only 30 rushing yards in a 23-7 win. The pig will return to Iowa City, but even more importantly, the hogs up front are getting it done in classic Kirk Ferentz fashion. Iowa has rushed for at least 200 yards in every game this season and went for 246 against a Minnesota defense that thought it had made strides in that area. This team has an identity, and it starts with the power running game led by Mark Weisman and a solid offensive line. Quarterback Jake Rudock has shown an ability to extend plays, and Iowa even got an explosive play in the passing game when Damond Powell took a short pass 74 yards to paydirt. The defense is also playing well right now; the Gophers' only score came after a long kickoff return. The Hawkeyes are 4-1 and gets Michigan State at home next week, while Northwestern and Michigan still must come to Kinnick Stadium. The schedule is difficult the rest of the way, but Iowa will have a big say in who wins the Legends.

4. Nathan Scheelhaase is the Big Ten's most improved player: A year ago, Scheelhaase was sputtering at the helm of one of the nation's worst offenses, hardly resembling the player who had shown promise as a freshman and during the first part of his sophomore season. No Big Ten player has made bigger strides in the past season than the Illinois senior quarterback, who threw five first-half touchdown passes Saturday against Miami (Ohio) and finished with 278 pass yards on 19 of 24 attempts. Scheelhaase leads the Big Ten in passing yards and is second in touchdowns (12), tripling his total from last season. He's just five touchdown passes shy of his single-season best and 15 shy of Kurt Kittner's single-season team record. Offensive coordinator Bill Cubit deserves a lot of credit for Scheelhaase's surge -- and that of the entire Illini offense -- but Scheelhaase clearly is back on track after a year and a half in the dark. It will be interesting to see what he does this week against Nebraska's shaky defense.

5. Future starts now for Etling, Purdue: Darrell Hazell stuck with senior quarterback Rob Henry through this season's early offensive struggles, but the Purdue coach realized it was time for a change Saturday against Northern Illinois. The last straw was Henry's second interception of the first half, a terribly thrown floater into the Huskies' end zone. That prompted Hazell to give the reins over to true freshman Danny Etling, the prized former recruit who made his collegiate debut. This was no fairy tale, so Etling didn't lead the Boilermakers to a comeback victory. He threw two interceptions, including a pick-six, and narrowly avoided another one. But Etling (19-for-39, 241 yards) did show good mobility and flashed his strong arm, especially on his first career touchdown pass, a 16-yarder to Cameron Posey. The offense will have more of a chance to stretch the field with him under center. Quarterback is hardly the only problem for Purdue, which got housed 55-24 at home by a MAC team and might have a hard time finding another win this season. But while Boilers fans don't like to see the words "Danny" and "hope" in the same sentence, Etling at least gives them something to look forward to as Hazell tries to work the program out of this mess.

Good news: We are just 100 days away from the start of college football.

To mark the occasion, we're pulling out a checklist today of things that Big Ten teams need to accomplish between now and the start of the season. It's not quite "The Final Countdown" (cue GOB Bluth), but we are inching ever so close to kickoff. Here's what needs to happen in the next 100 days:

1. Identify a starting quarterback at Iowa, Indiana, Michigan State, Penn State, Purdue and Wisconsin: It seems as if there are an unusually high number of Big Ten teams who don't know for sure who their starting quarterbacks will be in the fall. (You could also add Illinois and Minnesota to this list, though it appears likely that Nathan Scheelhaase and Philip Nelson, respectively, would have to lose the job in the summer.) Iowa had a three-man race this spring that will probably come down to Jake Rudock and Cody Sokol in training camp. There's very little separation between Cameron Coffman, Nate Sudfeld and Tre Roberson at Indiana. Connor Cook continues to breathe down the neck of incumbent Andrew Maxwell at Michigan State. Tyler Ferguson claimed the starting job at Penn State during the spring, prompting Steven Bench to transfer, but highly touted recruit Christian Hackenberg will push for immediate time. Purdue will likely decide between senior Rob Henry and true freshman Danny Etling. Joel Stave and Curt Phillips separated themselves from the Wisconsin QB derby this spring, while incoming junior college transfer Tanner McEvoy could expand the race this summer. All these situations should work themselves out in August, but no team wants to be dealing with an unsettled quarterback competition once the season starts.

2. Solidify the defensive front sevens at Nebraska and Ohio State: The Huskers and Buckeyes stand out as two of the top Big Ten contenders in 2013, but both have serious questions at defensive line and linebacker. The issue is more dire at Nebraska, which struggled there last year and is replacing all but one starter from 2012. Summer arrivals, including junior college star Randy Gregory, could make an immediate impact, and players coming back from injury such as linebacker Zaire Anderson and defensive tackle Thad Randle will need to play up to potential. Ohio State is less concerned about its defense after the spring performance of defensive ends Noah Spence and Adolphus Washington, but linebacker Ryan Shazier is still the only returning starter in the front seven. Curtis Grant must finally live up to his talent to provide help to Shazier, and someone must assume John Simon's leadership role.

3. Locate the next great receivers: A few Big Ten teams, such as Nebraska, Penn State and Indiana, don't have to worry too much about who will catch the ball this year. But just about everybody else needs to find playmakers in the passing game. The top of that list includes Iowa, which couldn't generate a downfield passing attack last year; Illinois, which needs receivers to make new coordinator Bill Cubit's spread system work; Michigan State, whose young wideouts must improve on last year's shaky performance; Minnesota, which doesn't have many proven weapons to surround Nelson; and Wisconsin, which still must find a complement to Jared Abbrederis. Ohio State coach Urban Meyer is hoping some incoming freshmen augment a very thin receiver group, while Michigan needs to replace the production of Junior Hemingway and Roy Roundtree. Purdue and Northwestern have lots of speedy options but could use the emergence of a true No. 1 target. Receiver was a weak spot as a whole in the Big Ten in 2012, and hopefully some players will improve through offseason voluntary passing drills.

4. Strengthen the running game at Michigan, Michigan State, Indiana and elsewhere: It's a cliché to say that you have to run the ball to win, but in the case of the Big Ten, that's always been true. That's why it's so vital for the Wolverines and Spartans -- who both expect to contend in the Legends Division -- to find answers in their rushing attacks. Michigan is replacing its entire starting interior offensive line after struggling to get a running game going outside of Denard Robinson last year. Fitz Toussaint is hoping to bounce back from a disappointing season and a leg injury, while hotshot freshman Derrick Green could get lots of carries right away. Michigan State's efforts to replace workhorse extraordinaire Le'Veon Bell this spring ended up with converted linebacker Riley Bullough emerging as the top back in a mediocre field. Three incoming freshmen will compete for time right away this summer. Indiana coach Kevin Wilson put a heavy emphasis on the running game this spring, hoping for more balance after his team led the league in passing and finished last in rushing last season. Iowa has depth for once at running back but needs to stay healthy there, as the ground game is the key to the Hawkeyes' entire offensive philosophy. Nebraska also can't afford injuries, as Ameer Abdullah and Imani Cross are the lone backs with any experience. Illinois averaged just 3.5 yards per carry as a team last year, a number that must improve. And while Purdue loved what it saw from Akeem Hunt this spring, he still must prove he can be an every-down back after attempting only 42 carries last season.

5. Mesh with new coaches: Wisconsin's Gary Andersen and Purdue's Darrell Hazell are the fresh faces among head coaches in the league, and while they did a great job of connecting with their players this spring, they still need to get their new systems fully in place. The Badgers will be using some new, 3-4 looks on defense, while Hazell wants a more physical and disciplined team than we've seen from the Boilermakers of late. Michigan State has a new offensive playcaller in Dave Warner, while Cubit was one of many staff changes at Illinois. Penn State's John Butler takes over from Ted Roof as the Lions' defensive coordinator. With only 15 spring practices so far to implement their styles, those new coaches have had to rely on a lot of classroom time and players learning on their own. That will have to continue this summer during voluntary workouts and then will intensify when preseason practice begins. For new coaches, it's a race against the calendar -- and the calendar says there are only 100 days until kickoff.

Spring practice is under way in the Big Ten, so let's take a look at what's on tap for the six teams in the Leaders Division.

ILLINOIS

Spring start: March 5

Spring game: April 12

What to watch:

1. Coaching staff makeover: Illinois players are used to coaching changes, and Tim Beckman's staff received a significant overhaul during the winter as five assistants departed the program (four voluntarily). The biggest change comes at offensive coordinator, as former Western Michigan head coach Bill Cubit takes over. Cubit has to implement his system and identify more playmakers with a unit that finished last in the Big Ten in both scoring and total offense last season.

2. Lines in limbo: The Illini not only lost significant pieces on both the offensive and defensive lines, but they have new position coaches at both spots as well. Defensive line has been Illinois' strongest spot, but the team must replace two future NFLers in Michael Buchanan and Akeem Spence. Glenn Foster is also gone, so the front four will have a very different look. The offensive line struggled mightily in 2012 and needs young players like Michael Heitz and Ted Karras to take steps this spring.

3. Getting healthy: Illinois lost so many starters to injury in 2012 that it became difficult to get an accurate gauge on what Beckman could do with a healthy roster. Although linebacker Jonathan Brown and receiver Darius Millines will be limited this spring, the rest of the team is ready to go and Illinois added several potential big contributors from the junior-college ranks. If Illinois has any chance of taking a major step in 2013, its best players must stay on the field this spring and allow the coaches a chance to evaluate and scheme for the season.

INDIANA

Spring start: March 2

Spring game: April 13

What to watch:

1. Quarterback cluster: While some Big Ten teams (Penn State, Purdue) have hardly any experience at quarterback, Indiana has three signal-callers who have logged significant field time. Tre Roberson, who started the 2012 season before suffering a broken leg in Week 2, returns this spring, and it will be interesting to see how he looks and whether he outperforms Cameron Coffman and Nate Sudfeld. Coffman started the final 10 games last fall and passed for 2,734 yards and 15 touchdowns, while Sudfield added 632 pass yards and seven scoring strikes. Indiana's quarterback depth is a good problem to have, but it would be good to see some separation this spring.

2. Defensive leadership: Fielding a Big Ten-level defense remains Indiana's top priority, and the Hoosiers need leaders to develop this spring. Top linemen Adam Replogle and Larry Black Jr. depart, and Indiana needs to build depth up front after allowing a league-worst 231.3 rush yards per game in 2012. Linebacker is another spot IU must upgrade, and David Cooper should be ready to take the reins after recording 86 tackles in 12 starts a year ago. Like Illinois, Indiana also welcomes several junior-college defenders, including tackle Jordan Heiderman.

3. Secondary surge: All the question marks in Indiana's defensive front seven make it even more important for the secondary to make strides this spring. The Hoosiers have no shortage of experience in the back four with players like Greg Heban, Mark Murphy, Brian Williams (12 starts last season) and Antonio Marshall (started final seven games). There's potential for the secondary to be a strength for IU in 2013, but the group must make more plays after recording a league-low seven interceptions last fall.

OHIO STATE

Spring start: March 5

Spring game: April 13 (at Paul Brown Stadium, Cincinnati)

What to watch:

1. Taking a pass: The highest-scoring offense in the Big Ten returns every starter but two, and all that experience, talent and familiarity with the spread attack heading into Urban Meyer's second season with the Buckeyes figures to make them even more dangerous. The key will be how much more efficient Braxton Miller can become as a passer.

2. Getting defensive: For all the pieces the offense retains, the defense is a completely different story heading into spring camp. The Buckeyes have to replace the entire defensive line after losing three seniors and junior Johnathan Hankins to the draft, two starting linebackers are gone and the graduation of cornerback Travis Howard leaves an additional hole in the safety. There will be no shortage of competition for first-team reps.

3. Looking for leaders: Meyer and the senior class that has since departed quickly forged a deep bond, and he’s gone out of his way to praise those players' leadership as integral in the unbeaten season that started his tenure with the Buckeyes. Now he needs a new wave of emotional speakers and relentless workers to take the torch from the likes of John Simon and Zach Boren, and Meyer will be making a point to identify his best candidates over the 15 workouts leading into the summer.

-- Austin Ward, BuckeyeNation

PENN STATE

Spring start: March 18

Spring game: April 20

What to watch:

1. Quarterback competition: With the departure of fifth-year senior Matt McGloin, quarterback is now the biggest question mark on this team. Sophomore Steven Bench has a head start and will compete against juco early enrollee Tyler Ferguson. Christian Hackenberg won't join the team until summer. Can this no-huddle offense be as effective?

2. Replacing LBs Michael Mauti and Gerald Hodges: Mike Hull, who usually played inside, will have to make some adjustments as one of the expected replacements for the All-Big Ten linebacker tandem. The other spot is up for grabs, and fans should expect to see a battle between Ben Kline and Nyeem Wartman.

3. New faces at WR, TE: Redshirt freshman Eugene Lewis, the headliner of PSU's 2012 class, could challenge Brandon Moseby-Felder as the No. 2 WR target. Adam Breneman, the No. 1 tight-end recruit in the country, is also hoping to be recovered from a torn anterior cruciate ligament in time for the Blue-White Game. Both could be stars down the road for PSU.

-- Josh Moyer, NittanyNation

PURDUE

Spring start: March 18

Spring game: April 12

What to watch:

1. Behind these Hazell eyes: Yes, I'll justifiably take the abuse for the Kelly Clarkson reference, but new Purdue coach Darrell Hazell has his first chance to evaluate his team on the field this spring. Hazell brings a completely new coaching staff and a new approach to Purdue, which fell short of expectations in 2012 and has significant questions on both sides of the ball. He seems to be getting good buy-in from the players so far, but it'll be interesting to see how things progress during the 15 workouts this spring.

2. Quarterback race: If you like mysteries, you'll enjoy Purdue's quarterback competition this spring. The combination of a new coaching staff and unproven but talented candidates makes the race virtually impossible to predict. Hazell and new offensive coordinator John Shoop will study redshirt freshman Austin Appleby, who could have a slight edge to win the job, along with redshirt freshman Bilal Marshall and early enrollee Danny Etling, a decorated recruit. Don't forget about Rob Henry, who started in 2010 and would have been the top quarterback in 2011 if not for an ACL injury weeks before the season.

3. Short stopper: Purdue has to find a replacement for standout defensive tackle Kawann Short, the centerpiece of the defensive line the past few seasons. Bruce Gaston Jr. will continue to occupy the other top tackle spot, but there will be plenty of competition to join him in the starting lineup. Purdue's defensive line underachieved in 2012, and while Gaston and ends Ryan Russell and Ryan Isaac all return, the Boilers will really miss Short's production if they don't build more depth up the middle.

WISCONSIN

Spring start: March 9

Spring game: April 20

What to watch:

1. New era dawns: Consistency is the norm at Wisconsin, but players will have to adjust to a dramatically different coaching staff for the second consecutive season. This time, it includes a new leading man in Gary Andersen, who gets his first chance to work with the players on the practice field. Andersen doesn't plan to overhaul the schemes, but he and his coaches will put their spin on things and see what works. He'll also bring a different personality to practice but one that athletic director Barry Alvarez thinks will fit the program's culture.

2. Intrigue at quarterback: Arguably no team in America has a more interesting quarterback race than the Badgers do this spring. They have three players with starting experience -- Joel Stave, Curt Phillips and Danny O'Brien -- plus a talented redshirt freshman (Bart Houston) who arrived as a decorated recruit and a junior-college addition (Tanner McEvoy) brought in by the new coaches. Add in a new system under coordinator Andy Ludwig, and it's anyone's guess who will separate himself this spring. Be sure to tune in.

3. Secondary in the spotlight: The Badgers lose three of four starters in the secondary from the 2012 squad, including top cornerbacks Devin Smith and Marcus Cromartie. The new staff is aware of the numbers issue and signed junior-college All-America Donnell Vercher earlier this month. Other players who will compete for starting spots include cornerbacks Darius Hillary and Peniel Jean and safeties Michael Trotter and Michael Caputo. Wisconsin hopes to have some answers in the back four by the end of the spring.