Estádio: Court 4 Round: 44 Ground: Clay
| ITF - M15 Saraievo | 2021/05/31 10:00 | Peter Goldsteiner v Petar Jovanovic | 6-7,4-6 |
| ITF - M25 Kiseljak | 2021/05/25 12:40 | Zsombor Piros v Peter Goldsteiner | 6-3,7-5 |
| ITF - M15 Šibenik | 2021/05/19 12:20 | Peter Goldsteiner v David Pichler | 3-6,2-6 |
| ITF - M15 Šibenik | 2021/05/18 09:35 | Elgin Khoeblal v Peter Goldsteiner | 1-6,5-7 |
| ITF - M15 Šibenik | 2021/05/17 14:55 | Federico Marchetti v Peter Goldsteiner | 5-7,0-6 |
| ITF - M15 Šibenik | 2021/05/16 15:00 | Alen Moritz Hodzic v Peter Goldsteiner | 6-3,5-7,5-10 |
| ITF - M25 Praga | 2021/05/12 07:30 | Mischa Zverev v Peter Goldsteiner | 7-6,5-7,6-1 |
| ITF - M25 Praga | 2021/05/11 09:15 | Renta Tokuda v Peter Goldsteiner | 3-6,4-6 |
| ITF - M25 Velenje | 2021/07/04 07:30 | Pietro Schiavetti v Roko Horvat | 6-2,3-6,6-10 |
| UTR Pro Tennis Series - Zadar | 2021/07/03 07:00 | Matija Pecotic v Roko Horvat | 6-3,5-4 |
| UTR Pro Tennis Series - Zadar | 2021/07/01 08:00 | Roko Horvat v Anatoliy Petrenko | 6-2,6-1 |
| UTR Pro Tennis Series - Zadar | 2021/06/30 12:30 | Roko Horvat v Yaraslav Shyla | 5-7,6-3,3-5 |
| UTR Pro Tennis Series - Zadar | 2021/06/29 09:30 | Roko Horvat v Elijah Poritzky | 6-0,6-3 |
| UTR Pro Tennis Series - Zadar | 2021/06/28 11:00 | Roko Horvat v Rayane Oumaouche | 6-3,5-0 |
| ITF - M15 Šibenik | 2021/05/16 10:00 | Roko Horvat v Amaury Raynel | 6-7,3-6 |
| ITF - M15 Šibenik | 2021/04/18 08:00 | Lovre Erceg v Roko Horvat | 6-2,3-6,10-7 |