Age: 24
Occupation: Tennis player
Djokovic ended his historic 2011 season with the world's No. 1 ranking, $12.6 million in prize money, three Grand Slam titles (the Australian Open, the U.S. Open and Wimbledon) and a perfect 6-0 record against rival Rafael Nadal in finals. And after outlasting Nadal in a classic Australian Open final this year, the game's most entertaining star is one-quarter of the way to becoming the first man since Rod Laver in 1969 to complete a single-season Grand Slam by winning all four major titles.