Stadium: Court 7 Round: 25 Ground: Hardcourt outdoor
| ITF - M15 Monastir | 2021/02/13 08:30 | Mertens, Yannick v Gauthier Onclin | 6-3,1-6,2-6 |
| ITF - M15 Monastir | 2021/02/12 10:05 | Mertens, Yannick v Juan Bautista Torres | 6-2,6-3 |
| ITF - M15 Monastir | 2021/02/11 08:25 | Mertens, Yannick v Mugevicius, Lukas | 6-1,6-1 |
| ITF - M15 Monastir | 2021/02/10 08:30 | Mertens, Yannick v Stuart Parker | 5-7,6-4,6-3 |
| ITF - M15 Monastir | 2021/02/07 08:30 | Mertens, Yannick v Stuart Parker | 3-6,6-4,6-7 |
| ITF - M15 Monastir | 2021/02/06 08:30 | Mertens, Yannick v Kocevar-Desman, Tom | 6-3,6-2 |
| ITF - M15 Monastir | 2021/02/05 09:30 | Skander Mansouri v Mertens, Yannick | 6-3,1-6,4-6 |
| ITF - M15 Monastir | 2021/02/04 08:30 | Ajavon, Liova v Mertens, Yannick | 6-7,3-6 |
| ITF - M15 Monastir | 2021/03/04 08:30 | Mateus Alves v Schmitz, Constantin | 6-3,6-4 |
| ITF - M15 Monastir | 2021/03/02 08:30 | Schmitz, Constantin v Christoph Negritu | 6-4,7-6 |
| ITF - M15 Monastir | 2021/02/23 08:00 | Schmitz, Constantin v Vidal Azorin, Jose Fco | 6-4,3-6,4-6 |
| ITF M15 Alkmaar | 2020/08/25 14:30 | Schmitz, Constantin v Benjamin Hassan | 4-6,6-3,3-6 |
| Exo Tennis Germany Series | 2020/08/01 09:30 | Schmitz, Constantin v Benjamin Hassan | 6-7,7-6,0-6 |
| Exo Tennis Germany Series | 2020/07/31 08:00 | Schmitz, Constantin v Haerteis, Johannes | 0-6,3-6 |
| Exo Tennis Germany Series | 2020/07/30 08:00 | Schmitz, Constantin v Hazem Naw | 4-6,7-6,2-6 |
| Exo Tennis Germany Series | 2020/07/29 09:45 | Schmitz, Constantin v Daniel Vishnick | 6-1,6-2 |