Bizarre run: All disqualified!

Birmingham: Every runner, including the world's fastest man this year, was disqualified in a bizarre 400 metres heat that made athletics history on the second day of the world indoor championships on Friday.

Bralon Taplin was among the casualties after appearing to qualify for the semi-finals later on Friday by winning the third heat comfortably in 46.37 seconds.

But the Grenadan was ruled to have run out of his lane, along with the other three finishers, Jamaica's Steven Gayle, Latvia's Austris Karpinskis and Alonzo Russell from the Bahamas.

Another runner, Qatar's Abdalelah Haroun, was earlier red carded for false starting in the same heat.

It is the first time every athlete has been disqualified from a heat at a major championships, according to statistician Mark Butler.

All decisions were subject to appeal. There was no such drama in the final heat when Pavel Maslak eased though, qualifying behind Spain's Oscar Husillos as the Czech indoor specialist attempts to become the first three-time 400m champion at the event.

In the women's 400m heats, Americans Courtney Okolo (51.54) and Shakima Wimbley (52.43) both qualified comfortably, along with Switzerland's Lea Sprunger (52.46), who is expected to be their main rival.

Double Olympic sprint champion Elaine Thompson of Jamaica also eased through to the later stages of the 60m, posting 7.20 to finish behind Marie-Josee Ta Lou from the Ivory Coast, who continued her recent good form to win the heat in 7.17.

Thompson, who won bronze at the 2016 world indoors but has yet to replicate her best form of last year, appeared composed in making it through in what is shaping up to be one of the championship's most hotly contested events.

While Dutchwoman Dafne Schippers accelerated steadily to win her heat in 7.19, U.S. national champion Javianne Oliver was slowest off the blocks in the first heat, looking sluggish in posting 7.29 to finish third behind Norway's Ezinne Okparaebo.

The 23-year-old American ran the world's best this year of 7.02 at altitude but showed her inexperience at this level by only just making it through.