Former world champion Torri Edwards won the women's 100 metres in 11.02 seconds into a headwind.
The 2003 titlist was joined on the U.S. world championship team by 2005 world champion Lauryn Williams (11.16), Carmelita Jeter (11.17) and world 200 metres gold medallist Allyson Felix (11.25).
The U.S. has four world championship berths in the event because defending champion Williams received a bye.
IAAF female athlete of the year Sanya Richards dominated women's 400 metres qualifying in 50.02 seconds, the fastest time in the world this year. LaShawn Merritt was the fastest man in qualifying at 44.44 seconds.
Michael Tinsley added another 2007 world leader, topping the 400 metres hurdles semi-finals in 48.02 seconds.
Olympic and world champion Dwight Phillips claimed the men's long jump with a wind-assisted 8.36 metres, and world silver medallist Brad Walker won the men's pole vault at 5.70 metres.
World champion Bryan Clay withdrew from the decathlon competition, saying he was suffering aches and pains from a recent event. The Olympic silver medallist will still be eligible to defend his world title.
The championships continue until Sunday with the top three finishers qualifying for August's world championships provided they have met the standards.
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