Stadium: Court 2 Round: 62 Ground: Clay
| ITF M25 Kottingbrunn | 2021/07/18 07:30 | Peter Goldsteiner v Ondrej Valek | 6-2,6-2 |
| ITF M25 Telfs | 2021/07/13 07:30 | Peter Goldsteiner v Philip Bachmaier | 6-0,3-6,4-10 |
| ITF M25 Velenje | 2021/07/09 09:00 | Peter Goldsteiner v Gonzalo Lama | 2-6,4-6 |
| ITF M25 Velenje | 2021/07/08 09:45 | Oscar Jose Gutierrez v Peter Goldsteiner | 6-7,6-3,4-6 |
| ITF M25 Velenje | 2021/07/07 08:00 | Peter Goldsteiner v Gal Emersic Potocnik | 6-1,6-0 |
| ITF M25 Velenje | 2021/07/06 10:10 | Peter Goldsteiner v Tim Heger | 6-1,6-4 |
| ITF M25 Velenje | 2021/07/05 16:20 | Peter Goldsteiner v Roko Horvat | 7-6,6-4 |
| ITF M15 Sarajevo | 2021/05/31 10:00 | Peter Goldsteiner v Petar Jovanovic | 6-7,4-6 |
| ITF M25 Kottingbrunn | 2021/07/18 07:30 | Martin Zeljenka v Rafael Kis Balazs | 2-6,6-4,10-2 |
| ITF M25 Belgrade | 2021/06/29 07:00 | Bogdan Pavel v Martin Zeljenka | 6-1,6-3 |
| ITF M25 Belgrade | 2021/06/28 10:00 | Martin Zeljenka v Matvey Minin | 7-5,6-3 |
| ITF M25 Belgrade | 2021/06/27 12:00 | Martin Zeljenka v George Gregoriou | 6-1,6-1 |
| 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 |