| UTR Pro Tennis Series Barcelona | 2021/08/11 07:00 | Markos Kalovelonis v Xavier Gabarro | 6-3,6-0 |
| 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 Qual | 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 |
| UTR Pro Tennis Series Barcelona | 2021/08/11 07:00 | Jaume Pla Malfeito v Olexiy Kolisnyk | 2-6,2-5 |
| UTR Pro Tennis Series Barcelona | 2021/08/09 11:30 | Andrey Chepelev v Olexiy Kolisnyk | 2-6,4-6 |
| UTR Pro Tennis Series Barcelona | 2021/08/08 08:30 | Olexiy Kolisnyk v Osgar O'Hoisin | 7-6,3-6,5-2 |
| UTR Pro Tennis Series Barcelona | 2021/08/07 11:00 | Olexiy Kolisnyk v Marat Deviatiarov | 6-4,7-5 |
| UTR Pro Tennis Series Barcelona | 2021/08/06 07:00 | Olexiy Kolisnyk v Daniel Sancho Arbizu | 6-4,6-2 |
| UTR Pro Tennis Series Barcelona | 2021/08/05 08:30 | Olexiy Kolisnyk v Miguel Fernando Pereira | 4-6,6-6 |
| UTR Pro Tennis Series Barcelona | 2021/08/04 11:30 | Alberto C Sanchez v Olexiy Kolisnyk | 0-6,2-6 |
| UTR Pro Tennis Series Barcelona | 2021/08/03 10:00 | Alvaro Bueno Gil v Olexiy Kolisnyk | 1-6,6-3,6-6 |