Clarifying promised rules on female eligibility, track and field’s governing body set a September 1 deadline Wednesday for athletes to pass a gene test for competing at the world championships.

World Athletics, track and field's governing body, has set a Sept. 1 deadline for female athletes to pass a gene test for competing at the world championships in Tokyo.

USATF will administer cheek swabs at this week’s U.S. Track and Field Championships to comply with new requirements.

American star Ryan Lochte’s standard of 1:54.00 had stood since 2011 until the French sensation clocked 1:52.69 on Wednesday in Singapore.

French swimmer Léon Marchand took more than a second off the 200-meter individual medley world record on Wednesday to shatter American Ryan Lochte’s long-standing mark.

July 30 (Reuters) - Olympic champion Leon Marchand said his decision to opt for a reduced schedule at the world championships in Singapore had paid off handsomely after the Frenchman smashed the 200 metres individual medley world record on Wednesday.