Stadium: Court 8 Round: 28 Ground: Hardcourt outdoor
| 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 |
| ITF - M15 Helsinki | 2021/06/02 06:30 | Lucas Catarina v Vladimir Ivanov | 7-5,1-6,6-2 |
| Challenger - Oeiras | 2021/05/24 10:00 | Lucas Catarina v Nikolas Sanchez Izquierdo | 4-6,2-6 |
| Challenger - Oeiras | 2021/05/23 10:00 | Lucas Catarina v Ronald Slobodchikov | 6-1,6-3 |
| ITF - M15 Monastir | 2021/05/09 08:30 | Luca Potenza v Lucas Catarina | 1-6,6-2,6-1 |
| ITF - M15 Monastir | 2021/05/08 08:30 | Lucas Catarina v Alexander Donski | 7-6,1-6,6-4 |
| ITF - M15 Monastir | 2021/05/07 08:30 | Alibek Kachmazov v Lucas Catarina | 6-7,2-6 |
| ITF - M15 Helsinki | 2021/06/04 07:00 | Lilian Marmousez v Bruno Kuzuhara | 6-4,7-6 |
| ITF - M15 Helsinki | 2021/06/03 07:00 | Otto Virtanen v Lilian Marmousez | 5-7,6-1,4-6 |
| ITF - M15 Helsinki | 2021/06/02 06:30 | Karl Kiur Saar v Lilian Marmousez | 2-6,4-6 |
| ITF M15 Las Palmas | 2021/04/27 08:00 | Lilian Marmousez v Francisco Andreu Garcia | 6-4,5-7,7-10 |
| ITF M15 Las Palmas | 2021/04/26 09:30 | Lilian Marmousez v Mehdi Sadaoui | 7-5,7-5 |
| ITF - M15 Sibenik | 2021/04/22 09:40 | Lilian Marmousez v Lorenzo Bocchi | 6-7,5-7 |
| ITF - M15 Sibenik | 2021/04/20 14:30 | Alessandro Bega v Lilian Marmousez | 6-7,3-6 |
| Challenger - Lille | 2021/03/25 11:45 | Quentin Halys v Lilian Marmousez | 6-3,7-5 |