On the Hayward Field track in Oregon that will host the World Championships, the Tokyo 2020 silver medallist produced his personal best in the semi-finals before winning the final in 9.77, thus becoming the first man to beat 9.90 twice in the space of one day.

Marvin Bracy-Williams was second, equalling his personal best of 9.85, with third place, in 9.88, going to Trayvon Bromell, whose semi-final time of 9.81 was the second-fastest seen this year.

It will all make interesting viewing for the Italian who beat Kerley to the Olympic gold in Tokyo, Marcell Jacobs, who last month picked up a muscle injury at his first competition since the Games, a low-key meeting in Savona, but who is due to return to action today at the Italian Championships in Rieti.

Meanwhile, after the shock women’s 100m first-round exit of Sha'Carri Richardson, sixth on the all-time list with 9.72sec, there was another surprise in the final, which was won by relative unknown Melissa Jefferson of Coastal Carolina University in a wind-aided time of 10.69.

Although she benefited from a following wind of 2.9 metres per second - 0.9mps over the allowable limit for records - Jefferson, eighth at the recent National Collegiate Athletic Association Championships, recorded a wind-legal 10.82 in the semi-finals, where Aleia Hobbs was fastest in a personal best of 10.81.

Hobbs took second place in the final in 10.72, with the third and final place going to Twanisha Terry in 10.74.

Jefferson can now look forward to returning to this stretch of track for the World Championships that will run from July 15 to 24 against the likes of defending champion Shelly-Ann Fraser-Pryce, who, like all Doha 2019 gold medallists, has a wild card to defend their title.

The 35-year-old Beijing 2008 and London 2012 100m champion clocked 10.70 in her opening heat at the Jamaican Championships and ran part of the way through the semi-final without finishing, with reports suggesting her coach, Reynaldo Walcott, was satisfied with her form and progress after her opening run in Kingston.

Meanwhile the double Olympic 100 and 200m champion Elaine Thompson-Herah won her semi-final in 10.91.

Double world indoor women's pole vault champion Sandi Morris won the final at US trials with a clearance of 4.82 metres, the best seen this year, with her training partner, Tokyo 2020 champion Katie Nageotte, earning the third and final place on 4.65m.

Ryan Crouser, who set a men’s shot put world record of 23.37 metres at Hayward Field in winning last year’s US Olympic trials before successfully defending his title in Tokyo, made sure he will be contesting a world title he missed by one centimetre last time round after a winning effort of 23.12m.

Meanwhile the fellow American who took that Doha title, Joe Kovacs, was second on a season’s best of 22.87m.

Olympic women’s discus champlon Valarie Allman was an expected winner on 66.92m.