ARLINGTON, Texas -- The Dallas Cowboys wrapped up the preseason with a 30-13 win over the Miami Dolphins at Cowboys Stadium on Wednesday night. Unlike last season, when wide receiver Raymond Radway was injured in the closing seconds of the preseason at Miami, there were no such major health issues coming from this game. This was the last chance for several players to make an impact on the coaches and scouts, and join the 53-man roster.

What it means: The Cowboys finish the preseason 3-1 and have to make some hard decisions regarding the No. 3 quarterback spot, whether to keep a fourth running back or which running back to keep, whether Orie Lemon and Mario Butler make the team, and whether Danny Coale and Matt Johnson should earn paychecks in September.

McGee vs. Carpenter: There is this battle for the No. 3 quarterback position. Stephen McGee played the first half, led one touchdown drive and converted 13 first downs. He completed nine of 18 passes for 124 yards. The Cowboys led 20-6 at the break. Rudy Carpenter also led the Cowboys on a touchdown drive -- capped by a 58-yard run by Lance Dunbar -- and finished 4-of-10 for 48 yards. In addition, Carpenter had a 21-yard scramble. But it would appear neither quarterback did enough to secure a spot on the roster.

Only one starter plays: Between both units, only center Phil Costa played. Costa missed the first three preseason games with a strained lower back, and the Cowboys wanted to give him some snaps before putting him in a regular-season game. Costa didn't have any bad snaps, and it's unknown whether he had any blown assignments. David Arkin replaced Costa.

The running game is strong: There are no questions regarding the status of DeMarco Murray as the starter. Felix Jones has been guaranteed a roster spot by owner/general manager Jerry Jones. We thought the No. 3 running back gig was going to Phillip Tanner, but Dunbar came on strong Wednesday night. Dunbar ran with a burst, scoring on a 58-yard run. Let's not forget about Tanner, who burst up the middle for a 1-yard score. Dunbar rushed 15 times for 105 yards, and Tanner rushed for 48 yards on nine carries.

Lemon made his case: If linebacker Lemon was a bubble player, he should make the roster. He returned an interception 26 yards to give the Cowboys a 10-6 lead in the second quarter. Lemon was active on defense and, given what he does on special teams, should make the 53-man roster. Adrian Hamilton also was fighting for a roster spot, but he hasn't shown his pass-rush abilities on a consistent basis with the Cowboys.

Cowboys lose three players: Guard Derrick Dockery left the game for personal reasons, and fellow guard Daniel Loper suffered a hamstring injury. Cornerback Lionel Smith departed the game with a concussion. None of the three returned.

Who played well: Tyrone Crawford, Orie Lemon, Phillip Tanner, Lance Dunbar and Dan Bailey.

Who didn't: Teddy Williams, David Arkin, Stephen McGee.

Bailey is perfect: Kicker Dan Bailey finished the preseason 8-for-8 on field goal attempts. Bailey made kicks of 25, 30 and 26 yards Wednesday night. The Cowboys didn't have any concerns about him heading into the preseason, but unlike last season when the team had a kicking competition, nothing was going on here. It was all Bailey. The longest kick of the preseason by Bailey was 49 yards.

Ryan Tannehill makes the start: The eighth pick of the NFL draft, quarterback Ryan Tannehill made the start for the Dolphins and completed 5-of-7 passes for 35 yards. The former Aggie played with a presence and threw some strong passes, but he still has a ways to go to help the Dolphins.

What's next? The Cowboys must cut their roster to 53 players by Friday night and then finalize their practice squad roster with as many as eight players. The team will practice over the weekend at Valley Ranch and prepare for the regular season opener at the New York Giants.