Roger Federer from Switzerland returns the ball to Serbia's Novak Djokovic during the second day of Abu Dhabi Mubadala Tennis Championship, Friday, Dec. 30, 2011 in Abu Dhabi, United Arab Emirates. (AP Photo/Kamran Jebreili)

Associated Press
Roger Federer from Switzerland returns the ball to Serbia's Novak Djokovic during the second day of Abu Dhabi Mubadala Tennis Championship, Friday, Dec. 30, 2011 in Abu Dhabi, United Arab Emirates. (AP Photo/Kamran Jebreili)
Roger Federer from Switzerland returns the ball to Serbia's Novak Djokovic during the second day of Abu Dhabi Mubadala Tennis Championship, Friday, Dec. 30, 2011 in Abu Dhabi, United Arab Emirates. (AP Photo/Kamran Jebreili)
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