Stadium: Center Court Round: 26 Ground: Clay
| French Open | 2021/05/26 17:15 | Alejandro Tabilo v Sumit Nagal | 6-3,6-3 |
| French Open | 2021/05/25 17:30 | Roberto Marcora v Sumit Nagal | 3-6,3-6 |
| Challenger Heilbronn | 2021/05/13 10:00 | Bernabe Zapata Miralles v Sumit Nagal | 6-3,6-1 |
| Challenger Heilbronn | 2021/05/12 08:30 | Antoine Hoang v Sumit Nagal | 6-1,1-6,4-6 |
| Challenger Heilbronn | 2021/05/10 13:20 | Sumit Nagal v Denis Kudla | 7-5,1-6,6-1 |
| Challenger Prague | 2021/05/07 13:00 | Norbert Gombos v Sumit Nagal | 6-4,6-2 |
| Challenger Prague | 2021/05/06 10:00 | Sergiy Stakhovsky v Sumit Nagal | 6-4,1-6,4-6 |
| Challenger Prague | 2021/05/04 10:25 | Zdenek Kolar v Sumit Nagal | 2-6,4-6 |
| ITF M15 Sibenik | 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 |