Greene, a month shy of his 31st birthday, was in contention but hopped on his right leg, then fell to the track. The three-time world 100 champion, 2000 gold medalist, and 2004 Olympic bronze medalist had to be helped off the track, deprived of a shot at a fourth world crown.
Another winner of Olympic gold, Jeremy Wariner, surged ahead of close friend Darold Williamson to win an exceedingly fast 400.
The 21-year-old Texan won in 44.20 seconds, the fastest time in the world this year. Williamson, the NCAA champion and Wariner's former Baylor teammate, was second in 44.62. Andrew Rock came on at the finish to edge 19-year-old LaShawn Merritt for third and the final spot on the US team for the world championships Aug. 6-14 in Helsinki. Rock ran 44.70, Merritt 44.73.
Sanya Richards, just 20, led three runners under 50 seconds in the women's 400. Richards's winning time of 49.28 was a meet record and the world's fastest time this year by more than a half-second. She was followed by Dee Dee Trotter at 49.88 and Monique Henderson at 49.96.
Me'Lisa Barber, also running into a headwind, cruised ahead of the competition to win the women's 100 in 11.10.
Lashinda Demus, 22, won the 400 hurdles in a personal-best 53.35, second fastest in the world this year.
Alan Webb, 22, repeated as 1,500 champion, edging his training partner, Christopher Lukezic. Webb ran 3:41.97, Lukezic 3:42.06.
Stacy Dragila won her 17th US pole vault championship, ninth outdoors, clearing 14 feet 7 3/4 inches. The 34-year-old Dragila, the 2000 Olympic gold medalist, was more than a foot below her career best of 15-10 set last year.
