EUGENE, Ore. — Allyson Felix blocked out the knifing agony in her right ankle and made her first run at Olympic Trials look like a jog Friday night.
Sanya Richards-Ross felt a different kind of pain.
On a night Felix cruised on auto-pilot in the 400-meter qualifying round 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.
"I've had an amazing career," Richards-Ross said. "To have my last race be here, at Hayward Field, in front of these fans, it's incredible."
In addition to her four Olympic gold medals,...