Britain's Dina Asher-Smith, right, wins the women's 200 meters event at the Diamond League track and field meeting in Florence, Italy, Thursday, June 10, 2021. (Alfredo Falcone/LaPresse via AP)

FILE - In this June 20, 2021, file photo, Trayvon Bromell wins the men's 100-meter run at the U.S. Olympic Track and Field Trials in Eugene, Ore. Bromell is the favorite in the 100 at the upcoming Tokyo Games. (AP Photo/Ashley Landis, File)

FILE - In this June 26, 2021, file photo, Gabby Thomas celebrates after winning the final in the women's 200-meter run at the U.S. Olympic Track and Field Trials in Eugene, Ore. Harvard-educated sprinter Thomas could make headlines in the 200 at the upcoming Tokyo Games. (AP Photo/Ashley Landis, File)

FILE - In this Friday, Oct. 4, 2019 file photo, Jamaica's Shelly-Ann Fraser-Pryce, center, hands off to Jonielle Smith, right, during a women's 4x100 meter relay semifinal at the World Athletics Championships in Doha, Qatar. On Friday, June 25, 2021, Fraser-Pryce cruised to a victory in the 100 meters at Jamaican national championships and will head to Tokyo in search of her third Olympic gold medal. (AP Photo/Nariman El-Mofty, File)

FILE - In this Sept. 10, 2019, file photo, Mariya Lasitskene competes in the women's high jump final during the Match Europe against USA athletics competition on the Dinamo stadium in Minsk, Belarus. Three-time high jump world champion Lasitskene will be a favorite at the upcoming Tokyo Games after Russia named her to its 10-athlete team under rules limiting the size of its squad because of a long-running doping dispute. (AP Photo/Sergei Grits, File)

FILE - In this June 27, 2021, file photo, Noah Lyles, right, wins the final in the men's 200-meter run ahead of Kenny Bednarek, left, in second and Erriyon Knighton, in third, at the U.S. Olympic Track and Field Trials in Eugene, Ore. Lyles, the 200-meter world champion, will lead a strong contingent of American sprinters that includes teenager Knighton at the upcoming Tokyo Games. (AP Photo/Ashley Landis, File)

In this June 19, 2021 photo, Sha'Carri Richardson celebrates after winning the first heat of the semis finals in women's 100-meter runat the U.S. Olympic Track and Field Trials in Eugene, Ore. Richardson cannot run in the Olympic 100-meter race after testing positive for a chemical found in marijuana. Richardson, who won the 100 at Olympic trials in 10.86 seconds on June 19, told of her ban Friday, July 2 on the “Today Show.”(AP Photo/Ashley Landis)

FILE - In this June 27, 2021, file photo, Sydney McLaughlin sets a new world record in the finals of the women's 400-meter hurdles at the U.S. Olympic Track and Field Trials in Eugene, Ore. One of the most entertaining races at the upcoming Tokyo Games figures to be the women’s 400 hurdles, where McLaughlin set a new world record by edging Dalilah Muhammad at the U.S. track trials. (AP Photo/Ashley Landis, File)