United Arab Emirates

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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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Tomas Berdych of the Czech Republic returns the ball to Philipp Kohlschreiber of Germany 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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Tomas Berdych of the Czech Republic returns the ball to Philipp Kohlschreiber of Germany 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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Philipp Kohlschreiber of Germany returns the ball to Malek Jaziri of Tunisia 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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Tomas Berdych of the Czech Republic returns the ball to Jo Wilfried Tsonga of France 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 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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Novak Djokovic of Serbia returns the ball to Spain's Roberto Bautista Agut during the third day of the Dubai Tennis Championships in Dubai, United Arab Emirates, Wednesday, Feb. 26, 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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Spain's Roberto Bautista-Agut returns the ball to Novak Djokovic of Serbia during the third day of the Dubai Tennis Championships in Dubai, United Arab Emirates, Wednesday, Feb. 26, 2014. (AP Photo/Kamran Jebreili)

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Novak Djokovic of Serbia returns the ball to Spain's Roberto Bautista-Agut during the third day of the Dubai Tennis Championships in Dubai, United Arab Emirates, Wednesday, Feb. 26, 2014. (AP Photo/Kamran Jebreili)