Stadium: Court 2 Round: 14 Ground: Grass
| Challenger Orlando | 2021/06/09 16:00 | Thai-Son Kwiatkowski v Ulises Blanch | 6-7,6-3,2-6 |
| Challenger Biella | 2021/05/19 11:40 | Thai-Son Kwiatkowski v Ulises Blanch | 6-4,7-6 |
| Challenger Porto | 2021/06/29 11:20 | Ulises Blanch v Quentin Halys | 3-6,6-3,1-6 |
| Challenger Porto | 2021/06/28 10:00 | Ulises Blanch v Luis Faria | 6-3,6-3 |
| Challenger Porto | 2021/06/27 13:00 | Ulises Blanch v Goncalo Falcao | 6-1,6-2 |
| Challenger Milan | 2021/06/24 11:20 | Duje Ajdukovic v Ulises Blanch | 6-3,6-1 |
| Challenger Milan | 2021/06/21 15:00 | Guillermo Garcia-Lopez v Ulises Blanch | 6-3,3-6,2-6 |
| Challenger Orlando | 2021/06/11 17:20 | Ulises Blanch v Sam Riffice | 1-6,5-7 |
| Challenger Orlando | 2021/06/09 16:00 | Thai-Son Kwiatkowski v Ulises Blanch | 6-7,6-3,2-6 |
| Challenger Orlando | 2021/06/07 18:40 | Ulises Blanch v Kevin King | 6-4,6-4 |
| Wimbledon | 2021/06/22 10:00 | Thai-Son Kwiatkowski v Antoine Hoang | 6-3,3-6,4-6 |
| Challenger Orlando | 2021/06/09 16:00 | Thai-Son Kwiatkowski v Ulises Blanch | 6-7,6-3,2-6 |
| Challenger Orlando | 2021/06/08 16:10 | Ernesto Escobedo v Thai-Son Kwiatkowski | 4-6,6-7 |
| Challenger Little Rock | 2021/06/04 21:45 | Jack Sock v Thai-Son Kwiatkowski | 6-7,7-6,6-4 |
| Challenger Little Rock | 2021/06/03 16:00 | Alexander Ritschard v Thai-Son Kwiatkowski | 7-5,3-6,2-6 |
| Challenger Little Rock | 2021/06/02 20:40 | Stefan Kozlov v Thai-Son Kwiatkowski | 2-6,1-6 |
| Franska öppna | 2021/05/26 12:20 | Francisco Cerundolo v Thai-Son Kwiatkowski | 6-7,6-4,7-6 |
| Franska öppna | 2021/05/25 12:15 | Constant Lestienne v Thai-Son Kwiatkowski | 2-6,2-6 |