Stadium: Hard 21 Round: 25 Ground: Hardcourt outdoor
| ITF M15 - Šibenik | 2021/04/20 11:05 | Marvin Moeller v Sean Cuenin | 6-2,6-7,2-6 |
| ITF M25 - Meerbusch | 2021/04/13 13:30 | Tak Khunn Wang v Marvin Moeller | 6-4,6-3 |
| ITF M25 - Biel | 2021/03/29 12:05 | Yann Marti v Marvin Moeller | 6-4,6-7,10-5 |
| ITF - M15 Poitiers | 2021/03/19 13:10 | Kyrian Jacquet v Marvin Moeller | 6-2,6-3 |
| ITF - M15 Poitiers | 2021/03/17 10:30 | Marvin Moeller v Jean-Jacques Rakotohasy | 6-2,6-1 |
| ITF M25 Trimbach | 2021/03/11 12:00 | Dominic Stephan Stricker v Marvin Moeller | 6-1,6-4 |
| ITF M25 Trimbach | 2021/03/10 09:00 | Patrik Hartmeier v Marvin Moeller | 1-6,7-6,2-6 |
| ITF - M15 Monastir | 2021/02/16 13:00 | Marvin Moeller v Naoki Tajima | 2-6,3-6 |
| ITF M15 - Valldoreix | 2021/05/11 09:00 | Antonio Cayetano March v Rishab Agarwal | 7-5,4-6,10-12 |
| ITF M15 - Valldoreix | 2021/05/10 10:00 | Jaume Pla Malfeito v Antonio Cayetano March | 3-6,3-6 |
| ITF M15 - Valldoreix | 2021/05/09 14:00 | Antonio Cayetano March v Lluc Mir Anglada | 6-4,6-3 |
| Challenger Salinas 2 | 2021/04/28 15:00 | Nicolas Mejia v Antonio Cayetano March | 6-1,6-2 |
| Challenger - Salinas | 2021/04/19 18:55 | Jelle Sels v Antonio Cayetano March | 6-4,6-3 |
| ITF - M15 Antalya | 2021/03/30 11:00 | Benjamin Hassan v Antonio Cayetano March | 1-6,6-3,6-1 |
| ITF - M15 Monastir | 2021/03/09 08:30 | Juan Bautista Torres v Antonio Cayetano March | 6-1,6-0 |
| ITF - M15 Monastir | 2021/03/01 08:00 | Antonio Cayetano March v Viktor Jovic | 6-2,6-7,9-11 |