| UTR Pro Tennis Series Barcelona | 2021/08/10 10:00 | Markos Kalovelonis v Andrey Chepelev | 6-7,6-2,3-5 |
| UTR Pro Tennis Series Barcelona | 2021/08/09 13:45 | Markos Kalovelonis v Jaume Pla Malfeito | 6-3,5-3 |
| ITF - M25 Telavi | 2021/07/30 06:00 | Marco De Rossi v Markos Kalovelonis | 6-3,6-3 |
| Challenger - Nur-Sultan - Calificari | 2021/07/18 04:00 | Markos Kalovelonis v Sanjar Fayziev | 7-6,3-6,6-7 |
| ITF - M25 Nur-Sultan | 2021/07/07 07:00 | Markos Kalovelonis v Lucas Catarina | 6-4,6-7,2-6 |
| ITF - M15 Shymkent | 2021/06/03 07:25 | Vladyslav Manafov v Markos Kalovelonis | 6-1,3-6,6-3 |
| ITF - M15 Shymkent | 2021/06/02 07:05 | Saba Purtseladze v Markos Kalovelonis | 0-6,3-6 |
| ITF - M15 Shymkent | 2021/05/27 05:00 | Markos Kalovelonis v Ivan Liutarevich | 4-6,6-3,6-7 |
| UTR Pro Tennis Series Barcelona | 2021/08/10 10:00 | Jaume Pla Malfeito v Xavier Gabarro | 6-3,6-3 |
| UTR Pro Tennis Series Barcelona | 2021/08/04 08:30 | Pol Fernandez v Xavier Gabarro | 2-2 |
| UTR Pro Tennis Series Barcelona | 2021/08/03 07:00 | Osgar O'Hoisin v Xavier Gabarro | 6-3,6-2 |
| ITF - M25 Denia | 2021/07/26 14:30 | Andrey Chepelev v Xavier Gabarro | 6-4,6-0 |
| ITF - M25 Denia | 2021/07/25 09:30 | Xavier Gabarro v Higinio Sanchis Melero | 6-1,6-3 |
| ITF - M25 Gandia | 2021/07/19 10:00 | Albert Roglan v Xavier Gabarro | 2-6,6-3,10-6 |
| ITF - M25 Gandia | 2021/07/18 11:00 | Xavier Gabarro v Oliver Andersson | 6-4,6-1 |
| UTR Pro Tennis Series Barcelona | 2021/06/27 08:00 | Xavier Gabarro v Adria Soriano Barrera | 6-3,5-3 |