| UTR Pro Tennis Series - California | 2021/05/25 21:15 | Humberto Lopez v Rudy Quan | 7-5,5-0 |
| UTR Pro Tennis Series - California | 2021/05/23 19:30 | Theodore Dean v Humberto Lopez | 4-6,7-6,4-6 |
| UTR Pro Tennis Series - California | 2021/05/23 16:30 | Nathan Oppenheim v Hiroki Sakagawa | 1-6,1-6 |
| UTR Pro Tennis Series - Cancún | 2021/04/10 17:30 | Clemens Graute v Nathan Oppenheim | 6-4,5-7,6-3 |
| UTR Pro Tennis Series - Cancún | 2021/04/08 14:30 | Nathan Oppenheim v Jose Antonio Rodriguez Rodriguez | 6-3,6-2 |
| UTR Pro Tennis Series - Cancún | 2021/04/07 19:00 | Nathan Oppenheim v Juan A H Serrano | 0-6,0-6 |
| UTR Pro Tennis Series - Cancún | 2021/04/06 17:00 | Nathan Oppenheim v Manuel S Montemayor | 2-6,2-6 |
| UTR Pro Tennis Series - Cancún | 2021/04/05 16:00 | Nathan Oppenheim v Jean-Baptiste Badon | 4-6,4-6 |