The men's singles tennis event at the 2021 Summer World University Games was held from 29 July to 6 August at the Sichuan International Tennis Centre in Chengdu, China.
Switzerland's Henry von der Schulenburg won the gold medal, defeating Thailand's Kasidit Samrej in the final, 7–6(7–5), 4–6, 6–1.
Uzbekistan's Sergey Fomin and South Korea's Jang Yun-seok won the bronze medals.
Seeds All seeds receive a bye into the second round.
Draw
Finals
Top half Section 1
Section 2
Bottom half Section 3
Section 4
Consolation round Seeds All seeds receive a bye into the second round.
Finals
Top half Section 1
Section 2
Bottom half Section 3
Section 4
References