The Men's 100 metre butterfly S13 event at the 2020 Paralympic Games took place on 25 August 2021, at the Tokyo Aquatics Centre.

Heats

The swimmers with the top 8 times, regardless of heat, advanced to the final.

Rank Heat Lane Name Nationality Time Notes 1 2 4 Ihar Boki 55.12 2 2 5 Oleksii Virchenko 56.30 3 1 4 Islam Aslanov 57.29 4 1 5 Alex Portal 57.60 5 1 3 Muzaffar Tursunkhujaev 57.73 6 1 6 Douglas Matera 58.66 7 2 3 Dzmitry Salei 58.80 8 2 6 Kyrylo Garashichenko 59.92 9 1 2 David Henry Abrahams 1:00.69 10 1 7 Genki Saito 1:01.14 11 2 2 Roman Agalakov 1:02.21 12 2 1 Gerasimos Lignos 1:03.01 13 2 7 Uladzimir Sotnikau 1:03.68

Final

Rank Lane Name Nationality Time Notes+100m butterfly final 4 Ihar Boki 53.80 PR 5 Oleksii Virchenko 56.16 3 Islam Aslanov 57.12 4 6 Alex Portal 57.13 5 2 Muzaffar Tursunkhujaev 57.44 6 1 Dzmitry Salei 58.15 7 7 Douglas Matera 58.53 8 8 Kyrylo Garashichenko 58.63

See also Swimming at the 2016 Summer Paralympics – Men's 100 metre butterfly S13

References