Stadium: Court 8 Round: 25 Ground: Clay
| ITF M25 - Wrocław | 2021/07/03 09:00 | Orlando Luz v Oscar Jose Gutierrez | 6-2,6-4 |
| ITF M25 - Wrocław | 2021/07/02 09:00 | Vladyslav Orlov v Oscar Jose Gutierrez | 1-6,1-6 |
| ITF M25 - Wrocław | 2021/07/01 09:00 | Tomas Jirousek v Oscar Jose Gutierrez | 3-6,2-6 |
| ITF M25 - Wrocław | 2021/06/30 09:30 | Maciej Rajski v Oscar Jose Gutierrez | 3-6,4-6 |
| ITF M25 - Montauban | 2021/06/25 14:00 | Arthur Cazaux v Oscar Jose Gutierrez | 6-3,6-2 |
| ITF M25 - Montauban | 2021/06/24 13:30 | Oscar Jose Gutierrez v Nathan Seateun | 6-2,7-5 |
| ITF M25 - Montauban | 2021/06/22 10:00 | Erik Crepaldi v Oscar Jose Gutierrez | 1-6,2-6 |
| Challenger - Aix en Provence | 2021/06/15 13:05 | Renzo Olivo v Oscar Jose Gutierrez | 7-6,6-4 |
| ITF M25 Velenje | 2021/07/06 08:00 | Constantin Bittoun Kouzmine v Lukas Palovic | 6-2,2-6,10-8 |
| ITF M25 Velenje | 2021/07/04 07:30 | Constantin Bittoun Kouzmine v Francisco Vittar | 7-5,6-1 |
| ITF M25 - Den Haag | 2021/07/01 17:00 | Constantin Bittoun Kouzmine v Tim Van Rijthoven | 5-7,4-6 |
| ITF M25 - Den Haag | 2021/07/01 07:30 | Sidane Pontjodikromo v Constantin Bittoun Kouzmine | 6-7,2-6 |
| ITF M25 - Den Haag | 2021/06/28 07:55 | Dominik Palan v Constantin Bittoun Kouzmine | 6-2,2-6,6-10 |
| ITF M25 - Den Haag | 2021/06/27 08:00 | Roland Stuurman v Constantin Bittoun Kouzmine | 2-6,1-6 |
| ITF M25 - Alkmaar | 2021/06/20 17:00 | Constantin Bittoun Kouzmine v Michiel de Krom | 3-6,3-6 |
| ITF - M15 Monastir | 2021/05/19 13:05 | Constantin Bittoun Kouzmine v Yusuke Takahashi | 3-6,0-6 |