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!!!

Francine Niyonsaba went 8:19 to become the 5th fastest even outdoors and Elaine Thompson-Herah kept her incredible 2021 going with a 10.72 win.

Sifan Hassan completed her historic triple with gold in the 10,000m.

The intersex has been through an awful lot just to get Tokyo. For her to be tossed for a minor/phantom rules infraction that is inconsistently enforced is disgraceful. She and the fans deserve better - much better. *MB: I'm outraged that Francine Niyonsaba was DQd from Worlds. And you should be too. *LaPress.ca: FRANCINE, ALONE IN THE WORLD *AP: 'So alone': Niyonsaba criticizes own team after Olympics DQ

For the third year in a row, Caster Semenya was undefeated but was this the last of her dominance?  Domestically, Ajee Wilson was the best of a strong group of US runners. Should US#3 Ce'Aira Brown be ranked in the world's top 10?

The final Prefontaine Classic at the original Hayward Field didn't disappoint in terms of the women's distance events the women's 800, 1500 and 5000 all produced a world leading time.

Ken Goe's article reveals Niyonsaba got malaria while training with the OTC in South Africa this winter but somehow still managed to win world indoors. The OTC refused comment on the new hyperandrogenism rules.

Can Ajee Wilson get the elusive gold medal? How does Raevyn Rogers do? Does Niyonsaba stay undefeated lifetime indoors?

Semenya specifically requested that the meet run the 600 instead of the 800 and she may go for the 20-year-old WR of 1:22.63 while facing world silver medalist Francine Niyonsaba. Other world champions include Phyllis Francis, Ramil Guliyev, Dafne Schippers and Sam Kendricks vs Renaud Lavillenie.

With $100,000 on the line per event, Thursday's action should be spectacular.

Francine Niyonsaba and Ajee Wilson threw the best challenge at her they could, but in the end Caster Semenya was just too good and took her third world title (fifth global gold) in a PB and NR of 1:55.16.