Can Roger, Rafa slow the sublime Serb?
Who would have thought one year ago the great Roger Federer-Rafael Nadal rivalry would take a backseat to anyone? But here we are, embarking on a 2012 season that starts with one name: Novak Djokovic. His historic season took center stage over the dynamic duo that has collectively compiled 26 Slams.
Can Federer or Nadal reclaim his throne and dampen the Djokovic dominance? We look at whether either can upend the defending Aussie champ.
Roger Federer
How will the back injury affect him?
Federer has never retired from a match and doesn't like giving out walkovers, either, so it was worrying when he withdrew prior to his semifinal against Jo-Wilfried Tsonga in Doha. His only other walkover also had ties to France, occurring at the Paris Masters in 2008.

Yes, it was a back injury and Federer also said at the time his withdrawal was a precaution. Just over a week later, he took part at the elite Masters Cup -- and lost two of his three encounters, admittedly against stiffer competition than he'll face early in Melbourne.
Further, a tender back, Federer said, hampered him at Wimbledon in 2010 (when he lost to Tomas Berdych in the quarterfinals).
Federer has competed at the Australian Open with less than 100 percent strength, too. Unknown to him then, he had a mild case of mono in 2008. Djokovic beat him in the semis that year.
Federer has won majors nursing minor injuries in the past. But he wasn't 30 years old, either.
What are his chances against Djokovic?
Federer must be fully fit against Djokovic to have a chance of winning if they meet -- or hope that Djokovic is also ailing.
That's a start.
Federer clearly has the game to put Djokovic on the defensive and hit through the world No. 1, something Nadal can't do nearly as well. When Federer had success against Djokovic, he more often than not served well. (Unfortunately for him, when he's had back issues, the serve becomes less potent and he can throw in double faults.)
The Swiss was a point away from going 2-1 against Djokovic at the Slams in 2011.
What's the bottom line?
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No matter what the degree, injuries and illness aren't a good sign immediately ahead of majors. We know that. Take Nadal last year: Chasing the "Rafa Slam" in Melbourne, he contracted an illness before the tournament.
It threw him off his practice routine and contributed to the Spaniard's tweaking his hamstring in the quarterfinals.
That elusive 17th major for Federer looks like it will have to wait.
Nadal
Can a new racket overcome his shoulder injury?
The positive news for Nadal is that his legs aren't the problem. He can still run around and play through the issue (unlike Federer in Doha). Slams are, of course, the best of five sets, and the champions' heart remains. It'd take an inspired opponent to eliminate Nadal prior to the quarterfinals, something that hasn't happened at a Grand Slam since the 2009 French Open.
His knees were indeed a culprit at Roland Garros three years ago, along with a damaged psyche (because of the split of his parents) and a sizzling Robin Soderling.
Nadal, thinking longer term, has turned to a new racket for more pop. As one might expect, he continues to adjust to the new stick. He was happy with his performance against Mikhail Youzhny in the Doha quarterfinals but then lost to Gael Monfils the next day.
What are his chances against Djokovic?
Nadal lost all six of his matches against Djokovic in 2011. Is it time for the law of averages to kick in?
Nadal has said he doesn't feel intimidated facing the Serb. Rather, it's a case of improving a few things. One of those is getting free points on serve, and that's where he hopes the new racket will come in handy.
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Earlier this month, Nadal talked about the need to come to the net more often. To that end, he's been overly wary of Djokovic's scrambling and passing skills and has tended to stay put on the baseline, even when Djokovic is in trouble at the back of the court. Djokovic gets the ball back, a new rally begins and Djokovic usually prevails.
In the U.S. Open final, Nadal approached the net a mere 17 times -- but won 13 points. Djokovic, not as good of a volleyer, went to the net 47 times. When he had Nadal on the ropes in a rally, he ventured forward. At Wimbledon, Djokovic made 26 net approaches compared to Nadal's nine.
And as witnessed last year, Nadal's cross-court forehand gets eaten up by Djokovic's two-handed backhand.
What's the bottom line?
With Federer's health a question mark and Andy Murray still Slam-less, how can Nadal, even with the shoulder complaint and new racket, not be considered the second favorite behind Djokovic?
Regardless of the outcome Down Under, he'll have a nice, long break in February.
London-based Ravi Ubha covers soccer and tennis for ESPN.com. You can follow him on Twitter.
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Australian Open 2012
Women's singles:
Victoria Azarenka
Men's singles:
Novak Djokovic
Women's doubles:
Svetlana Kuznetsova and Vera Zvonareva
Men's doubles:
Leander Paes and Radek Stepanek
Mixed doubles:
Bethanie Mattek Sands and Horia Tecau
Courtcast
Slam Central »
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Watch on ESPN
Day 14
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• Garber: Djokovic now on the brink of history
• Ubha: Top five Slam finals of the Open era
• Harwitt: Reversal of fortune for Rafael Nadal
• Ubha: Breaking down Djokovic-Nadal
• Djokovic wins epic final over Nadal
• Highlight: Djoker needs six hours for win
• Patrick McEnroe breaks down match
• Djoker's thoughts on memorable win
Day 13
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• Azarenka routs Sharapova to take title
• Garber: Double the pleasure for Azarenka
• Gerstner: Sharapova completely outclassed
• Bryans denied record 12th Slam title
• Ubha: Nadal, Djoker goes beyond an Oz title
• Hot Button: Who will win the men's final?
• Bodo: How Nadal can end skid versus Djoker
• Azarenka slams Sharapova in finale
• Doesn't get any better for Azarenka
• Digital Serve: Who will win men's final?
Day 12
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• Djokovic beats Murray in 5 thrilling sets
• Harwitt: Djokovic guts out five-set thriller
• Wilansky: Breaking down Djokovic, Murray
• Ubha: Sharapova, Azarenka to battle
• Hot Button: Who will win the women's final
• Vote: Where does Sharapova rank?
• Vote: Do you believe in Djoker?
• Digital Serve: Women's final preview
• Novak Djokovic on spectacular win
• Djokovic beats Murray in five sets
Day 11
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• Recaps: Women | Men
• Garber: Nadal continues to dominate Federer
• Wilansky: Breaking down Nadal, Federer
• Gerstner: Sharapova, Azarenka pass test
• Ubha: Will Novak Djokovic recover in time?
• Azarenka takes down Clijsters
• Sharapova ousts Kvitova
• Rafa takes out Fed in four sets
• Digital Serve: Djoker or Murray?
Day 10
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• Recaps: Women | Men
• Ubha: Andy Murray semi-bound once again
• Garber: Djoker and Murray to tango
• Gerstner: Sharapova, Kvitova reach semis
• Ubha: Rafa versus Roger never gets old
• Ubha: Top five Federer-Nadal matches
• Hot Button: Who will win Rafa-Roger?
• Ubha: Can Sharapova avenge Wimby loss?
• Rod Laver and Roger Federer talk tennis
• Maria Sharapova eases in to semifinals
• Murray mauls Nishikori
• Djokovic foils Ferrer's bid
• Federer-Nadal preview
• Who will win the women's semis?
Day 9
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• Recaps: Women | Men
• Ubha: Doubts setting in for Novak Djokovic?
• Ubha: Red-hot Federer scorches del Potro
• Garber: Awaiting the Oz-some Rafa-Fed clash
• Gerstner: Same sad ending for Wozniacki
• Vote: Will Wozniacki ever win a Slam title?
• Clijsters beats Wozniacki in two sets
• Digital Serve: Can Ferrer foil Djoker's run?
• Nadal needs for hours to beat Berdych
• Federer destroys del Potro
Day 8
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• Recaps: Women | Men
• Ubha: Maria Sharapova survives scare
• Ubha: Serena misfires in every respect
• Gerstner: Serena Williams not herself
• Ubha: Why the Murray-Lendl duo will work
• Tandon: Fallout from the handshake snub
• Ivan Lendl assesses Andy Murray
• Federer talks about his recent good play
• Serena addresses loss in Oz
• Makarova upsets Serena
• Mary Joe on Serena's loss
• Djoker beats Hewitt in four sets
• Digital Serve: Fed ready for DelPo
