Defending champion Mark Philippoussis lost in the first round of the Shanghai Open on Tuesday, beaten 3-6, 6-4, 6-4 by Glenn Weiner, an American ranked No. 133. Philippoussis, seeded fourth, has yet to win a title this year and his ranking has fallen from No. 9 to No. 76, mostly because of injuries. He hasn't won a match since the fourth round at Wimbledon, and this was his fifth straight defeat.