Niyonsaba, who is banned from running in women's events between 400m and the mile as she is intersex, ran 5:21.56 to destroy Sonia O'Sullivan's outdoor world record of 5:25.36 which had stood since 1994. Niyonsaba's mark also was faster than Genzebe Dibaba's indoor world record of 5:23.75 set in 2017. In men's action, Devon Allen became the second man in 2021 to break 13:00 as he ran a new pb of 12.99. Other winners included Getnet Wale (8:12 steeple) and Ryan Crouser (22.84).
- MB: Francine Niyonsaba breaks her first WORLD RECORD!!!
- Zagreb: Ryan Crouser Brings The Curtain Down In Zagreb With 22.84m Meet Record He was pushed by New Zealand's Tom Walsh who finished second with 22.39m.
- Bellinzona: Fraser-Pryce Runs 10.78, De Grasse Over Kerley, Gatlin, Chanelle Price Wins 800 (1:59)