| UTR Pro Tennis Series Zadar | 2021/09/28 08:00 | Borna Devald v Alen Rogic-Hadzalic | 3-6,4-5 |
| UTR Pro Tennis Series Zadar | 2021/09/27 15:30 | Borna Devald v Myroslav Bondar | 6-0,6-1 |
| ITF M15 Sibenik | 2021/04/19 14:30 | Borna Devald v Tim Heger | 3-6,2-6 |
| ITF M15 Sibenik | 2021/04/18 13:00 | Borna Devald v Obrad Markovski | 6-3,5-7,10-7 |
| ITF M15 Opatija | 2021/03/24 13:10 | Corentin Denolly v Borna Devald | 6-3,6-2 |
| ITF M15 Rovinj | 2021/03/15 08:00 | Damien Wenger v Borna Devald | 6-0,4-6,10-2 |
| ITF M15 Porec | 2021/03/08 10:00 | Samuel Brosset v Borna Devald | 7-5,6-4 |
| ITF M15 Porec | 2021/03/07 11:30 | Borna Devald v Julian Onken | 7-5,6-2 |
| UTR Pro Tennis Series Zadar | 2021/09/28 08:00 | Myroslav Bondar v Admir Kalender | 2-6,2-6 |
| ITF M15 Ulcinj | 2021/09/12 09:30 | Alexandre Aubriot v Admir Kalender | 6-1,6-3 |
| ITF M15 Bad Waltersdorf | 2021/08/25 08:50 | Lukas Krainer v Admir Kalender | 6-4,3-6,6-2 |
| ITF M15 Bad Waltersdorf | 2021/08/23 13:00 | Admir Kalender v Fletcher Scott | 6-4,6-2 |
| ITF M15 Bad Waltersdorf | 2021/08/23 07:00 | Luigi Sorrentino v Admir Kalender | 2-6,1-6 |
| ITF M15 Łódź | 2021/08/16 13:15 | Taiyo Yamanaka v Admir Kalender | 3-6,7-6,10-7 |
| ITF M15 Novi Sad | 2021/08/01 14:00 | Alex Knaff v Admir Kalender | 7-5,6-4 |
| ITF M15 Skopje | 2021/06/09 09:15 | Admir Kalender v Nicholas David Ionel | 2-6,6-3,0-6 |