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American fan-favourite Sha'Carri Richardson has failed to advance in the women's 100m at the US championships, stunning onlookers and ending her hopes of competing in the event at the worlds.
Richardson got off to a rough start and never fully recovered, walking past members of the media after finishing fifth in her heat in 11.31 seconds, a far cry from the speedy, 10.85-second performance she produced in New York earlier this month.
The top three finishers in the Eugene, Oregon, meeting who meet certain qualifying standards, and reigning global title-holders advance to the first world championships ever to be held in the United States at the same track starting on July 15.
Richardson was among the favourites in the event, after dominating at the US Olympic trials a year ago, only to see her ticket to Tokyo evaporate following a positive cannabis test.
Aleia Hobbs, a Tokyo relay silver medallist, posted the fastest time in the women's heats (10.88), but Richardson is still expected to feature in the 200m.
Tokyo silver medallist Fred Kerley produced a world-leading 9.83 sec in the men's 100 metres heats while world champion Christian Coleman, who returned to action in January after serving an 18-month suspension for breaching anti-doping whereabouts rules, won his heat in 10.08. Trayvon Bromell clinched his in 10.10.
"I feel pretty decent. I feel like there's definitely a lot I can still continue to build off of," said Coleman "I feel pretty good for a prelim and so I'm pretty excited to try to put it all together tomorrow."
The top three finishers in Eugene, who meet certain qualifying standards, and reigning global title-holders advance to the first world championships.
A late surge propelled 800m world champion Donavan Brazier to a win in his heat in a time of 1:46.49, his best performance of the season.
Twice world bronze medallist Ajee Wilson posted the quickest time in the women's heats with 2:00.37, while 20-year-old Tokyo gold medal winner Athing Mu and bronze medallist Raevyn Rogers also advanced.
In the women's 400m hurdles, world record holder and Tokyo gold winner Sydney McLaughlin led all the way to win her heat handily in 54.11, with reigning world champion Dalilah Muhammad missing out due to injury.