Stadium: TK PALILULA C1 Round: 62 Ground: Clay
| ITF M15 Sibenik | 2021/05/17 11:00 | Martin Zeljenka v Martin Breysach | 6-7,3-6 |
| 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 |