Stadium: Court 2 Round: 44 Ground: Hardcourt outdoor
| ITF M25 Idanha-A-Nova | 2021/07/18 10:30 | Raphael Lambling v Osgar O'Hoisin | 1-6,6-3,10-7 |
| ITF M25 Idanha-A-Nova | 2021/07/13 08:00 | Yasha Zemel v Osgar O'Hoisin | 6-4,4-6,12-10 |
| ITF M25 Idanha-A-Nova | 2021/07/12 12:00 | Guilherme Valdoleiros v Osgar O'Hoisin | 4-6,1-6 |
| ITF M25 Idanha-A-Nova | 2021/07/11 10:30 | Osgar O'Hoisin v Martin Breysach | 6-4,6-4 |
| ITF M25 Bakio | 2021/06/30 08:30 | Osgar O'Hoisin v Kaichi Uchida | 3-6,5-7 |
| ITF M25 Bakio | 2021/06/29 08:00 | Marco Brugnerotto v Osgar O'Hoisin | 2-6,6-4,8-10 |
| ITF M25 Bakio | 2021/06/27 15:40 | Antonio Prat v Osgar O'Hoisin | 2-6,2-6 |
| Davis Cup | 2021/06/19 08:00 | Aleksandre Bakshi v Osgar O'Hoisin | 6-4,6-3 |
| ITF M25 Idanha-A-Nova | 2021/07/18 14:30 | Daniel Batista v Ivan Zaytsev | 6-3,6-4 |
| ITF M25 Idanha-A-Nova | 2021/07/12 10:30 | Yasha Zemel v Ivan Zaytsev | 6-3,6-3 |
| ITF M25 Idanha-A-Nova | 2021/07/11 08:00 | Eduardo Morais v Ivan Zaytsev | 2-6,1-6 |
| ITF M25 Nur-Sultan | 2021/07/07 11:35 | Edan Leshem v Ivan Zaytsev | 6-2,6-2 |
| ITF M25 Nur-Sultan | 2021/07/06 07:50 | Ivan Zaytsev v Kirill Kolganov | 6-2,6-2 |
| ITF M15 Shymkent | 2021/04/12 03:55 | Felipe Mikkelsen v Ivan Zaytsev | 6-3,6-1 |
| ITF M15 Shymkent | 2021/04/06 05:30 | Bulat Galiev v Ivan Zaytsev | 7-6,6-4 |
| ITF M15 Shymkent | 2021/04/05 08:45 | Roman Konovalov v Ivan Zaytsev | 0-6,0-6 |