Though tennis stars Andy Roddick, 24, and James Blake, 26, are rivals on the court, it's totally friendly competition. Sure, they've got different personalities – Roddick is a fun-loving prankster, while Blake is a cerebral former Harvard student – but the guys keep each other grounded: When Blake appeared in a New York Times magazine fashion spread in 2003 before the U.S. Open, Roddick played a joke on him by covering the locker room with the photos.