The youngest American to be ranked No. 1 in the world, Andy Roddick officially retired from competitive tennis after losing to Juan Martin del Potro at the U.S. Open, the site of his only Grand Slam title. Roddick defeated Juan Carlos Ferrero in the 2003 U.S. Open Final just days after his 21st birthday, and he remains the last North American male to win a Grand Slam singles event. Roddick would appear in three Wimbledon finals, but lose all three to Roger Federer. Roddick retires with 32 career titles and grossed over $20 million in career earnings. Roddick also holds several serve records, with a smash that reached speeds of over 150 MPH.