Stadium: MTA 24 Round: 62 Ground: Clay
| ITF - M15 Antalya | 2021/06/20 07:00 | Kenneth Raisma v Garmendia Olasagasti, Inigo | 6-4,6-3 |
| ITF M15 Marbella | 2021/05/23 08:00 | Garmendia Olasagasti, Inigo v Miranda Cisneros, Jose Joaquin | 3-6,1-6 |
| ITF M15 Cairo | 2021/04/18 08:30 | Yanais Laurent v Garmendia Olasagasti, Inigo | 6-2,6-1 |
| ITF M15 Cairo | 2021/04/12 08:30 | Garmendia Olasagasti, Inigo v Fellin, Manfred | 2-6,2-6 |
| ITF M15 Cairo | 2021/04/11 11:00 | Stone, Zakai v Garmendia Olasagasti, Inigo | 2-6,5-7 |
| ITF M25 La Nucia | 2021/03/14 13:00 | Garmendia Olasagasti, Inigo v Leopold Zima | 3-6,1-6 |
| ITF M15 La Nucia | 2021/03/08 11:00 | Garmendia Olasagasti, Inigo v Bas Mengual, Ivan | 2-6,2-6 |
| ITF M25 Villena | 2021/01/31 10:30 | Garmendia Olasagasti, Inigo v Mattia Bellucci | 3-6,4-6 |
| ITF - M15 Shymkent | 2021/06/02 11:45 | Petr Bar Biryukov v Bondarevskiy, Yan | 3-6,2-6 |
| ITF - M15 Shymkent | 2021/06/01 09:20 | Campo, Antonio v Petr Bar Biryukov | 4-6,6-3,10-7 |
| ITF - M15 Shymkent | 2021/05/31 06:35 | Alexey Dubinin v Petr Bar Biryukov | 2-6,2-6 |
| ITF - M15 Shymkent | 2021/05/24 04:00 | Louroi Martinez v Petr Bar Biryukov | 6-4,6-1 |
| ITF M15 St Petersburg | 2021/04/15 09:00 | Tyurnev, Evgeny v Petr Bar Biryukov | 6-1,6-1 |
| ITF M15 St Petersburg | 2021/04/13 09:00 | Petr Bar Biryukov v Saplin, Kirill | 6-4,6-1 |
| ITF M15 St Petersburg | 2021/04/06 09:00 | Nedelko, Ivan v Petr Bar Biryukov | 6-3,6-1 |
| ITF M15 St Petersburg | 2021/02/11 11:10 | Tyurnev, Evgeny v Petr Bar Biryukov | 6-2,7-5 |