FILE - In this Aug. 15, 2016, file photo, Bahamas' Shaunae Miller-Uibo falls over the finish line to win gold ahead of United States' Allyson Felix, right, in the women's 400-meter final during the athletics competitions of the 2016 Summer Olympics at the Olympic stadium in Rio de Janeiro, Brazil. Miller-Uibo won gold in Rio with a dive at the finish of the 400 meters. She's diving in at the Tokyo Games with plans to not only defend her title but chase after gold in the 200 meters. (AP Photo/Matt Slocum, File)

FILE - In this Oct. 4, 2019, file photo, Shaunae Miller-Uibo of Bahamas, silver, smiles during the medal ceremony for the women's 400-meter the World Athletics Championships in Doha, Qatar. Miller-Uibo won gold in Rio with a dive at the finish of the 400 meters. She's diving in at the Tokyo Games with plans to not only defend her title but chase after gold in the 200 meters. (AP Photo/Nariman El-Mofty, File)

FILE - In this Oct. 3, 2019, file photo, Shaunae Miller-Uibo, of Bahamas, looks at the scoreboard after winning silver in the women's 400-meter final at the World Athletics Championships in Doha, Qatar. Miller-Uibo won gold in Rio with a dive at the finish of the 400 meters. She's diving in at the Tokyo Games with plans to not only defend her title but chase after gold in the 200 meters. (AP Photo/Martin Meissner, File)