Stadion: Court 5 Round: 62 Ground: Clay
| ITF - M25 - Madrid | 2021/09/13 09:00 | Nikolas Sanchez Izquierdo v Vojtech Vlkovsky | 6-4,6-4 |
| Challenger - Sevilla | 2021/09/06 11:00 | Nikolas Sanchez Izquierdo v Tomas Barrios Vera | 6-4,2-6,5-7 |
| Challenger - Prag | 2021/08/24 08:30 | Nikolas Sanchez Izquierdo v Franco Agamenone | 3-6,3-6 |
| ITF - M25 - Prostejov | 2021/08/21 07:50 | Facundo Diaz Acosta v Nikolas Sanchez Izquierdo | 4-6,6-1,4-6 |
| ITF - M25 - Prostejov | 2021/08/20 08:00 | Nikolas Sanchez Izquierdo v Alex Rybakov | 6-3,6-2 |
| ITF - M25 - Prostejov | 2021/08/19 10:10 | Zsombor Piros v Nikolas Sanchez Izquierdo | 6-4,6-7,2-6 |
| ITF - M25 - Prostejov | 2021/08/18 08:00 | Martin Krumich v Nikolas Sanchez Izquierdo | 0-6,2-6 |
| ITF - M25 - Prostejov | 2021/08/17 10:35 | Matej Panik v Nikolas Sanchez Izquierdo | 0-6,2-6 |
| ITF - M25 - Madrid | 2021/09/13 09:00 | Hermanni Tiainen v Constantinos Koshis | 4-6,4-6 |
| ITF - M15 - Sharm El Sheikh | 2021/02/02 07:30 | Aidan Mchugh v Constantinos Koshis | 6-2,6-4 |
| ITF - M15 - Sharm El Sheikh | 2021/02/01 10:30 | Constantinos Koshis v Robert Strombachs | 3-6,6-2,10-6 |
| ITF - M15 - Sharm El Sheikh | 2021/01/31 07:00 | Lucas Hellfritsch v Constantinos Koshis | 2-6,5-7 |
| ITF - M15 - Antalya | 2021/01/13 09:45 | Constantinos Koshis v Federico Arnaboldi | 1-6,2-6 |
| ITF - M15 - Antalya | 2021/01/12 07:00 | Constantinos Koshis v Igor Trunov | 6-2,6-4 |
| ITF - M15 - Antalya | 2021/01/11 07:00 | Billy Harris v Constantinos Koshis | 7-6,6-7,6-10 |
| ITF - M15 - Antalya | 2021/01/10 06:00 | Arda Azkara v Constantinos Koshis | 6-7,6-0,8-10 |