The men's singles WH1 tournament at the 2020 Summer Paralympics in Tokyo took place between 1 and 4 September 2021 at Yoyogi National Gymnasium.
Seeds These were the seeds for this event: (bronze medalist) (gold medalist) (silver medalist)
Group stage The draw of the group stage revealed on 26 August 2021. The group stage was played from 1 to 3 September. The top two winners of each group advanced to the knockout rounds.
Group A
Date Time Player 1 Score Player 2 Set 1 Set 2 Set 3 1 Sep 20:40 Lee Dong-seop 2–0 Jakarin Homhual 23–21 21–16 2 Sep 15:20 Thomas Wandschneider 1–2 Jakarin Homhual 19–21 21–17 12–21 3 Sep 11:00 Lee Dong-seop 2–1 Thomas Wandschneider 17–21 21–19 21–17
Group B
Date Time Player 1 Score Player 2 Set 1 Set 2 Set 3 1 Sep 20:40 Lee Sam-seop 1–2 Hiroshi Murayama 21–15 13–21 17–21 2 Sep 16:00 Young-chin Mi 0–2 Hiroshi Murayama 8–21 7–21 3 Sep 11:40 Lee Sam-seop 2–0 Young-chin Mi 21–18 21–13
Group C
Date Time Player 1 Score Player 2 Set 1 Set 2 Set 3 1 Sep 21:20 Qu Zimo 2–0 Osamu Nagashima 21–9 21–12 2 Sep 14:40 David Toupé 0–2 Osamu Nagashima 6–21 12–21 3 Sep 11:00 Qu Zimo 2–0 David Toupé 21–11 21–13
Finals The knockout stage was played from 3 to 4 September.
References