Rafael Nadal, Serena Williams
Fresh off equaling Bjorn Borg's six French Open titles, Rafael Nadal could match another of the Swede's impressive feats: winning on the French clay and Wimbledon grass back-to-back for the third time. "It's the toughest turnaround in tennis," says NBC analyst Mary Carillo, "but Nadal is something very special indeed." Borg did it from 1978-80, and the Spaniard took home both trophies in 2008 and last year...
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