Chinese sprinter Su Bingtian returned with a superb dash at the Prefontaine Classic in Eugene, Oregon as he clocked a personal best time of 9.90 seconds in the high-octane 100-meter sprint on Saturday. However, the timing was adjudged to a wind-assisted one and thus won’t be considered for records.

Su was looking to continue his strong season in the meet where, three years ago, the fastest Chinese sprinter beat China's national record with a time of 9.99 seconds, becoming the first Asian-born athlete to break the sub-10 second barrier. Christian Coleman, the world champion in the indoor 60 meters, took the early lead but was soon reeled in by his US compatriot Ronnie Baker, who crossed the line ahead of the rest of the pack with the world's fastest time this year, a wind-aided 9.78 seconds.

Coleman came second at 9.84 seconds while Great Britain's Reece Prescod made it to the podium with 9.88 seconds before Su clocked his personal best, which turned out to be wind-assisted. Incidentally, last year at the same event, Su did achieve a sub-10 second time with a then personal best of 9.92 seconds. However, the tailwind (+2.4 M/S) was above the allowed limit of 2.0 M/S, therefore the time wasn’t counted as a national record or personal best.

Meanwhile, in the women’s 100 meters, Marie Josee Ta Lou continued her winning ways as she came from behind to outpace fellow Ivorian Murielle Ahoure in a wind-legal 10.88 seconds. Ahoure was close behind in 10.90, while Olympic gold medalist Elaine Thompson took third in 10.98 seconds

However, the highlight of the meet was Olympic champion South African Caster Semenya, who produced another peerless display of middle-distance running to clock a meet record and world-leading time of 1 minute, 55.92 seconds in the women’s 800 meters.

The men’s 200 meters produced an equally stunning performance from Noah Lyles as the 20-year-old American went on to shatter his personal best to win the title in 19.69 seconds, which is the joint fastest time in the world this year.