EUGENE, Ore. (AP) — Allyson Felix ran through the pain.
Sanya Richards-Ross couldn't overcome it.
And, in the strangest twist of all, Friday night's biggest track news came 3,000 miles away from the U.S. Olympic Trials, when a tweak in Usain Bolt's hamstring threatened to derail the Jamaican champion and change everyone's Olympic math.
On a night Felix successfully auto-piloted her injured right ankle through 400-meter qualifying to keep her chance at a 200-400 double alive, Richards-Ross bid a tearful adieu to the fans, after pulling up 250 meters into her lap around the track — her hamstring too tight to carry on.