Who's the next big thing in tennis?
Last season was a tough one for ATP prospects. The big prizes went to mid-career veterans, while up-and-comers like Juan Martin del Potro, Marin Cilic, Ernests Gulbis and Thiemo de Bakker fizzled for one reason or another. Now another group of fresh faces is making some noise, signaling this could be a better year for young contenders. We take a look at the five hottest 21-and-unders, led by last week's San Jose titlist, Milos Raonic.
1. Milos Raonic
He sent out a sign of things ...
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