U.S. sprinter Sanya Richards-Ross
Richards-Ross has an automatic bye into worlds in the 400, courtesy of her win in Berlin two years ago. But she has to earn her spot in the 200 this week at nationals.
Allyson Felix isn't quite as confident she will attempt to run both the 200 and 400 at worlds, saying she's "50-50" on the idea should she qualify.
Felix has a bye into the 200 by winning in Berlin, but needs to earn a spot in the 400.
It's not an easy double because of all the rounds and how closely the two races are typically crammed together.
The schedule at worlds sets up more favorably for Richards-Ross, since her best event, the 400, will be held first. After two days of rest, the 200 begins.
"I would love for it to be reversed," said Felix, a three-time world champion in the 200. "Of course, you want to do your favorite event first. I would have to sacrifice a little bit to do (the 400) first."
This could be a gauge to see if either tries to double at the 2012 London Olympics, if the schedule permits.
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