Stadium: Court 5 Round: 62 Ground: Clay
| ITF M15 Sibenik | 2021/05/16 07:30 | Joris Hoogland v Martin Zeljenka | 6-7,3-6 |
| ITF M15 Prijedor | 2021/05/09 09:30 | Kristijan Juhas v Martin Zeljenka | 6-1,6-1 |
| ITF M15 Sibenik | 2021/04/19 12:20 | Gorazd Srbljak v Martin Zeljenka | 6-0,6-2 |
| ITF M15 Sibenik | 2021/04/18 10:00 | Martin Zeljenka v Anze Arh | 7-5,1-6,10-3 |
| ITF M15 Szekesfehervar | 2019/09/01 10:30 | Martin Zeljenka v Tomas Liska | 4-6,2-6 |
| ITF M25 Gyor | 2019/08/25 09:00 | Martin Zeljenka v Mate Voros | 3-6,6-7 |
| ITF M15 Baja | 2019/08/12 08:00 | Roko Horvat v Martin Zeljenka | 6-3,2-6,10-7 |
| ITF M15 Targu Mures | 2019/08/06 08:00 | Martin Zeljenka v Gilad Tamar | 6-7,6-2,7-10 |
| ITF M15 Sibenik | 2021/05/16 10:00 | Rafael Kis Balazs v Martin Breysach | 0-6,4-6 |
| ITF M15 Majadahonda | 2021/05/02 16:15 | Alexis Musialek v Martin Breysach | 6-1,6-1 |
| ITF M15 Las Palmas | 2021/04/25 14:30 | Rafael Giotis v Martin Breysach | 5-7,6-2,10-4 |
| ITF M15 Sibenik | 2021/04/20 12:15 | Martin Breysach v David Pichler | 2-6,1-6 |
| Challenger Lille | 2021/03/21 15:15 | Martin Breysach v Filip Cristian Jianu | 3-6,3-6 |
| ITF M15 Poitiers | 2021/03/19 11:00 | Martin Breysach v Lucas Poullain | 0-6,3-6 |
| ITF M15 Poitiers | 2021/03/18 09:30 | Martin Breysach v Max Wiskandt | 6-2,6-7,6-4 |
| ITF M15 Poitiers | 2021/03/17 09:00 | Mick Veldheer v Martin Breysach | 1-6,6-4,6-7 |