Stadium: Court 3 Round: 25 Ground: Hardcourt outdoor
| ITF M25 Lesa | 2021/08/25 10:45 | Andrea Basso v Markos Kalovelonis | 6-3,6-2 |
| UTR Pro Tennis Series Barcelona | 2021/08/14 08:40 | Pablo Carretero v Markos Kalovelonis | 6-7,1-0 |
| UTR Pro Tennis Series Barcelona | 2021/08/12 13:00 | Markos Kalovelonis v Olexiy Kolisnyk | 4-6,4-6 |
| 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 Johannesburg | 2021/09/16 07:55 | Makoto Ochi v Vaughn Hunter | 3-6,3-6 |
| ITF M25 Johannesburg | 2021/09/14 09:55 | Makoto Ochi v Robbie Arends | 6-3,6-2 |
| ITF M15 Monastir | 2021/08/18 10:25 | Sascha Gueymard Wayenburg v Makoto Ochi | 6-3,6-2 |
| ITF M15 Monastir | 2021/08/12 08:00 | Takuya Kumasaka v Makoto Ochi | 6-4,6-4 |
| ITF M15 Monastir | 2021/08/11 07:30 | Mousa Alkotop v Makoto Ochi | 3-6,6-1,2-6 |
| ITF M15 Heraklion | 2021/06/09 06:30 | Makoto Ochi v Alexis Musialek | 4-6,2-6 |
| ITF M15 Heraklion | 2021/06/02 06:30 | Makoto Ochi v Billy Harris | 7-6,5-7,0-6 |
| ITF M15 Sharm El Sheikh | 2021/04/07 08:50 | Luke Johnson v Makoto Ochi | 6-2,6-1 |