The quad singles wheelchair tennis tournament at the 2020 Paralympic Games in Tokyo was held at the Ariake Tennis Park in Kōtō, Tokyo from 28 August to 4 September 2021.[1]
The defending champion was Dylan Alcott, who was the number 1 seed for the tournament.[2] Alcott succeeded in winning the fourth leg of a Golden Slam, having won the Australian Open, French Open and Wimbledon earlier in the year.[3]