Stadium: Court 2 Round: 26 Ground: Hardcourt outdoor
| Challenger Biella | 2021/05/19 11:40 | Thai-Son Kwiatkowski v Ulises Blanch | 6-4,7-6 |
| 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 |
| French Open | 2021/05/26 12:20 | Francisco Cerundolo v Thai-Son Kwiatkowski | 6-7,6-4,7-6 |
| French Open | 2021/05/25 12:15 | Constant Lestienne v Thai-Son Kwiatkowski | 2-6,2-6 |
| Challenger Biella | 2021/05/20 11:25 | Thai-Son Kwiatkowski v Zhizhen Zhang | 4-6,6-7 |
| Challenger Biella | 2021/05/19 11:40 | Thai-Son Kwiatkowski v Ulises Blanch | 6-4,7-6 |
| Challenger Orlando | 2021/06/07 18:40 | Ulises Blanch v Kevin King | 6-4,6-4 |
| Challenger Little Rock | 2021/06/04 18:25 | Ulises Blanch v Emilio Gomez | 2-6,0-6 |
| Challenger Little Rock | 2021/06/03 19:15 | Christopher Eubanks v Ulises Blanch | 4-6,6-7 |
| Challenger Little Rock | 2021/06/02 15:00 | Ulises Blanch v Zachary Svajda | 5-7,6-3,6-3 |
| ATP Parma | 2021/05/22 10:00 | Ulises Blanch v Benjamin Bonzi | 3-6,5-7 |
| Challenger Biella | 2021/05/19 11:40 | Thai-Son Kwiatkowski v Ulises Blanch | 6-4,7-6 |
| Challenger Biella | 2021/05/18 08:30 | Elliot Benchetrit v Ulises Blanch | 4-6,4-6 |
| ATP Miami | 2021/03/22 19:55 | Damir Dzumhur v Ulises Blanch | 7-6,6-4 |