|Date||25 – 27 July 2021|
|Location||Olympic Aquatics Centre, 2-1, 2chome, Tatsumi, Koto-ku, Tatsumi-no-Mori Seaside Park, Tokyo, Japan|
|Participants||41 from 30 countries|
The 2016 gold medalist Ryan Murphy (USA) was back and his world record from Rio still held. He was the 2015 and 2017 World Champion but, in 2019, China’s Xu Jiayu had won gold at Worlds, while Yevgeny Rylov (ROC) took silver and Australia’s Mitch Larkin won bronze. All four made the final in Tokyo along with Rylov’s teammate Kliment Kolesnikov, who had led the preliminary round in 52.15. Murphy was fastest in the semi-finals, swimming 52.24 in the first heat as Kolesnikov was second on 52.29.
Murphy was in lane four in the final, with Kolesnikov, next to him in lane five, taking the lead and reaching the turn in 24.90, narrowly leading over Rylov, with Murphy in third. Murphy had the fastest second half but it was not enough to get gold, which went to Rylov, who narrowly defeated Kolesnikov – 51.98 to 52.00. Three days later, Rylov would double up by winning the 200 backstroke, with Murphy taking silver in that event.
|16||Yohann N'Doye Brouard||FRA||–|
|22||Quah Zheng Wen||SGP||–|