Serbia's tennis player Novak Djokovic, left, plays with children during a visit to a school for mentally challenged children in Belgrade, Serbia, Wednesday, Feb. 6, 2013. Djokovic visited the school where the player’s charity fund donated euro 50,000 to be used for building a special playground. After winning the Australian Open last month, Djokovic says he is enjoying the off-season time with his family and friends in Serbia and will aim for the Roland Garros title this year _ the one Grand Slam tournament the World No-1 has not won so far. (AP Photo/Darko Vojinovic)

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