Stadium: Stadium 1 Round: 25 Ground: Hardcourt outdoor
| Challenger Cary | 2021/07/20 21:00 | Jack Sock v Ulises Blanch | 2-6,6-4,6-2 |
| ATP Newport | 2021/07/12 18:40 | Brayden Schnur v Ulises Blanch | 6-2,7-6 |
| ATP Newport | 2021/07/11 20:10 | Ulises Blanch v Thai-Son Kwiatkowski | 2-6,6-2,7-6 |
| 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 Cary | 2021/07/19 21:00 | Christian Harrison v Shuichi Sekiguchi | 6-4,6-4 |
| Challenger Salinas 2 | 2021/04/27 18:40 | Shuichi Sekiguchi v Pedro Sakamoto | 2-6,4-6 |
| Challenger Salinas | 2021/04/21 15:00 | Shuichi Sekiguchi v Nicolas Jarry | 1-6,2-6 |
| Challenger Salinas | 2021/04/19 16:00 | Hiroki Moriya v Shuichi Sekiguchi | 1-6,6-7 |
| Challenger Orlando | 2021/04/12 15:30 | Altug Celikbilek v Shuichi Sekiguchi | 4-6,6-4,7-5 |
| Challenger Cleveland | 2021/03/16 18:40 | Alexis Galarneau v Shuichi Sekiguchi | 6-3,6-1 |
| Challenger St. Petersburg | 2021/03/08 10:00 | Duje Ajdukovic v Shuichi Sekiguchi | 7-5,6-2 |
| Challenger St. Petersburg | 2021/03/01 13:45 | Shuichi Sekiguchi v Cem Ilkel | 3-6,2-6 |