Roger Federer

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Tomas Berdych of Czech Republic reacts after losing a point against Roger Federer of Switzerland during the final match of the Dubai Duty Free Tennis Championships in Dubai, United Arab Emirates, Saturday, March 1, 2014. (AP Photo/Kamran Jebreili)

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Roger Federer of Switzerland celebrates after beating Tomas Berdych of Czech Republic during the final match of the Dubai Duty Free Tennis Championships in Dubai, United Arab Emirates, Saturday, March 1, 2014. (AP Photo/Kamran Jebreili)

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Roger Federer of Switzerland returns the ball to Tomas Berdych of Czech Republic during the final match of the Dubai Duty Free Tennis Championships in Dubai, United Arab Emirates, Saturday, March 1, 2014. (AP Photo/Kamran Jebreili)

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Novak Djokovic of Serbia reacts after he missed a ball against Roger Federer of Switzerland during a semi final match of the Dubai Tennis Championships in Dubai, United Arab Emirates, Friday, Feb. 28, 2014. (AP Photo/Kamran Jebreili)

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Novak Djokovic of Serbia returns the ball to Roger Federer of Switzerland during a semi final match of the Dubai Duty Free Tennis Championships in Dubai, United Arab Emirates, Friday, Feb. 28, 2014. (AP Photo/Kamran Jebreili)

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Novak Djokovic of Serbia returns the ball to Roger Federer of Switzerland during a semi final match of the Dubai Duty Free Tennis Championships in Dubai, United Arab Emirates, Friday, Feb. 28, 2014. (AP Photo/Kamran Jebreili)

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Roger Federer of Switzerland returns the ball to Novak Djokovic of Serbia during a semi final match of the Dubai Duty Free Tennis Championships in Dubai, United Arab Emirates, Friday, Feb. 28, 2014. (AP Photo/Kamran Jebreili)

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Roger Federer of Switzerland celebrates after he beats Lukas Rosol of the Czech Republic during a quarter final match of the Dubai Duty Free Tennis Championships in Dubai, United Arab Emirates, Thursday, Feb. 27, 2014. (AP Photo/Kamran Jebreili)

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Roger Federer of Switzerland, right, comforts Radek Stepanek of Czech after beating him during the third day of the Dubai Duty Free Tennis Championships in Dubai, United Arab Emirates, Wednesday, Feb. 26, 2014. (AP Photo/Kamran Jebreili)

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Roger Federer of Switzerland celebrates after he beat Radek Stepanek of the Czech Republic during the third day of the Dubai Duty Free Tennis Championships in Dubai, United Arab Emirates, Wednesday, Feb. 26, 2014. (AP Photo/Kamran Jebreili)

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Roger Federer of Switzerland reacts after he beat Radek Stepanek of Czech Republic during the third day of the Dubai Duty Free Tennis Championships in Dubai, United Arab Emirates, Wednesday, Feb. 26, 2014. (AP Photo/Kamran Jebreili)

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Switzerland's Roger Federer celebrates after winning his match over Ilija Bozoljac of Serbia during their Davis Cup World Group play-off first round tennis match between Serbia and Switzerland, in Novi Sad, Serbia, Friday, Jan. 31, 2014. (AP Photo/Darko Vojinovic)