Stadium: Court 2 Round: 44 Ground: Hardcourt outdoor
| ITF M25 Idanha-A-Nova | 2021/07/11 08:00 | Yasha Zemel v David Quayle | 7-6,6-2 |
| ITF M15 Almada | 2021/07/05 09:00 | Yasha Zemel v Raphael Lambling | 4-6,7-6,8-10 |
| ITF M15 Almada | 2021/07/04 12:00 | Yasha Zemel v Pedro Liborio | 6-0,6-0 |
| ITF M15 Heraklion | 2021/06/11 09:20 | Alexis Musialek v Yasha Zemel | 7-6,3-6,6-1 |
| ITF M15 Heraklion | 2021/06/10 07:30 | Petros Tsitsipas v Yasha Zemel | 6-7,2-6 |
| ITF M15 Heraklion | 2021/06/08 08:00 | Yasha Zemel v Dusty H. Boyer | 6-4,6-3 |
| ITF M15 Heraklion | 2021/06/01 06:30 | Reese Stalder v Yasha Zemel | 6-1,6-4 |
| ITF M15 Heraklion | 2021/05/30 09:00 | Jeremy Schifris v Yasha Zemel | 6-4,2-6,8-10 |
| 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 |
| ITF M15 Antalya | 2021/03/15 08:30 | Ivan Zaytsev v Sidane Pontjodikromo | 2-6,4-6 |
| ITF M15 Antalya | 2021/03/14 07:00 | Jim Walder v Ivan Zaytsev | 4-6,2-6 |