Stadium: Court 3 Round: 62 Ground: Hardcourt outdoor
| ITF M15 Girona | 2021/10/17 10:30 | Michalis Sakellaridis v Gerard Oltra Guiral | 7-5,6-4 |
| ITF M15 Girona | 2021/10/17 10:30 | Michalis Sakellaridis v Gerard Oltra Guiral | 7-5,6-4 |
| ITF M15 Xàtiva | 2021/08/01 10:00 | Gerard Oltra Guiral v Max Alcala Gurri | 1-6,0-6 |
| ITF M25 Uriage | 2021/07/12 09:00 | Gerard Oltra Guiral v Youcef Rihane | 2-6,2-6 |
| ITF M25 Uriage | 2021/07/11 14:00 | Gerard Oltra Guiral v Baptiste Rey | 6-2,7-6 |
| ITF M15 Madrid | 2021/10/27 08:00 | Michalis Sakellaridis v Vladislav Ivanov | 1-6,4-6 |
| ITF M25 Madrid | 2021/10/26 08:00 | Jorge Martinez Martinez v Michalis Sakellaridis | 6-3,6-4 |
| ITF M25 Madrid | 2021/10/25 10:30 | Daniel L Salmeron v Michalis Sakellaridis | 1-6,3-6 |
| ITF M15 Girona | 2021/10/18 10:30 | Michalis Sakellaridis v Lucas Bouquet | 1-6,5-7 |
| ITF M15 Girona | 2021/10/17 10:30 | Michalis Sakellaridis v Gerard Oltra Guiral | 7-5,6-4 |
| ITF M15 Platja D'Aro | 2021/10/11 08:30 | Michalis Sakellaridis v Lorenzo Joaquin Rodriguez | 1-6,2-6 |
| UTR Pro Tennis Series Zadar | 2021/10/03 11:00 | Borna Devald v Michalis Sakellaridis | 6-3,7-5 |
| UTR Pro Tennis Series Zadar | 2021/10/02 13:00 | Filip Maric v Michalis Sakellaridis | 2-6,2-5 |