Stadium: Court 3 Round: 25 Ground: Hardcourt outdoor
| ITF - M25 Champaign | 2021/07/30 15:00 | Yu Hsiou Hsu v Alfredo Perez | 3-6,6-1,6-3 |
| ITF - M25 Champaign | 2021/07/29 17:00 | Alfredo Perez v Rio Noguchi | 6-1,6-3 |
| ITF - M25 Champaign | 2021/07/28 16:45 | Lucas Horve v Alfredo Perez | 3-6,1-6 |
| ITF - M25 Champaign | 2021/07/27 16:45 | Alfredo Perez v Cannon Kingsley | 2-6,6-3,10-7 |
| ITF - M25 Champaign | 2021/07/26 15:00 | Alfredo Perez v Nicholas Bybel | 6-1,6-3 |
| ITF - M15 Edwardsville | 2021/07/20 14:00 | Alfredo Perez v Siphosothando Montsi | 6-2,4-6,5-10 |
| UTR Pro Tennis Series - Nevada | 2021/06/30 15:00 | Jared Pratt v Alfredo Perez | 4-6,2-6 |
| UTR Pro Tennis Series - Nevada | 2021/06/28 15:00 | Bradley Frye v Alfredo Perez | 6-7,6-6 |
| Challenger - Lexington | 2021/07/26 19:25 | Ulises Blanch v Shuichi Sekiguchi | 6-3,6-4 |
| 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 |