Stadium: Court 8 Round: 25 Ground: Hardcourt outdoor
| 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 |
| ITF M15 Shymkent | 2021/05/26 04:00 | Vladyslav Manafov v Markos Kalovelonis | 2-6,6-3,3-6 |
| ITF M15 Tbilisi | 2021/05/20 06:00 | Markos Kalovelonis v Benjamin Lock | 4-6,4-6 |
| ITF M15 Tbilisi | 2021/05/19 07:25 | Keenan Mayo v Markos Kalovelonis | 4-6,7-6,3-6 |
| ITF M15 Antalya | 2021/04/08 07:00 | Markos Kalovelonis v Adam Pavlasek | 6-3,6-7,0-6 |
| ITF M15 Antalya | 2021/04/07 08:50 | Markos Kalovelonis v Cheong-Eui Kim | 6-2,6-4 |
| ITF M25 Bakio | 2021/07/01 14:10 | Lucas Catarina v Miguel Damas | 6-3,4-6,6-7 |
| ITF M25 Bakio | 2021/06/30 12:35 | Lucas Catarina v Juan Bautista Otegui | 4-6,7-5,6-0 |
| Davis Cup | 2021/06/19 10:00 | Petros Chrysochos v Lucas Catarina | 4-6,6-3,6-3 |
| Davis Cup | 2021/06/17 09:30 | Lucas Catarina v Simon Carr | 4-6,4-6 |
| Davis Cup | 2021/06/16 09:05 | Lucas Catarina v Liam Delicata | 6-0,6-1 |
| ITF M15 Helsinki | 2021/06/05 07:00 | Lucas Catarina v Lilian Marmousez | 3-6,3-6 |
| ITF M15 Helsinki | 2021/06/04 07:00 | Lucas Catarina v Clement Tabur | 4-6,7-5,6-3 |
| ITF M15 Helsinki | 2021/06/03 08:50 | Lucas Catarina v Andrea Del Federico | 6-0,6-2 |