New York – Chants of "Let's go, Andy!" rang out between points during the last service game of his career, and again before the start of what would wind up as the last return game. Always a fan favorite at the U.S. Open, and the 2003 champion, Andy Roddick headed into retirement with a 6-7 (1), 7-6 (4), 6-2, 6-4 loss to Juan Martín del Potro of Argentina in the fourth round at Flushing Meadows on Wednesday. It was an emotional farewell for Roddick, who sat in his changeover chair, covering his face with a white towel, after sailing a...