Mo Farah leads Olympic champs, world-record chasers; London preview

Caster Semenya on new testosterone study: ‘I don’t have time for idiots’Mo Farah, Allyson Felix and Elaine Thompson headline a Diamond League meet in London on Sunday, while world-record watch is on for two athletes who aren’t Olympians.

NBC Sports Gold coverage starts at 7:20 a.m. ET. Universal HD’s broadcast is at 9 ET.

Farah, Felix and Thompson, who own a combined 12 Olympic gold medals, are ramping up for the world championships from Aug. 4-13, also at London’s Olympic Stadium.

Also keep an eye on American Keni Harrison, who broke the 100m hurdles world record at this meet one year ago, two weeks after shockingly failing to make the U.S. Olympic team. Harrison’s recent form suggests…