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epa04642604 Roger Federer of Switzerland serves against Novak Djokovic of Serbia during their final match of the Dubai Duty Free Tennis ATP Championships in Dubai, United Arab Emirates, 28 February 2015. Federer won the match in two sets and served during the course of the game the 9000th ace of his career, only the 4th player in the open era who reached that mark. EPA/ALI HAIDER