Stadium: Court 3 Opatija Round: 62 Ground: Clay
| ITF M15 Opatija | 2021/03/21 13:00 | Milos Vukovic v Stefan Loncar | 2-6,6-4,7-10 |
| ITF M25 La Nucia | 2021/03/14 14:00 | Kuzey Cekirge v Stefan Loncar | 6-3,6-2 |
| ITF M25 Villena | 2021/01/31 10:30 | Stefan Loncar v Zakhar Trapeznikov | 2-6,2-6 |
| ITF M15 Káhira | 2020/12/06 07:00 | Vignesh Peranamallur v Stefan Loncar | 6-4,7-6 |
| ITF M15 Káhira | 2020/11/29 08:00 | Mohab Hamed v Stefan Loncar | 6-2,6-4 |
| ITF M15 Benicarlo | 2020/11/23 11:30 | Alexander Weis v Stefan Loncar | 6-4,6-2 |
| ITF M15 Benicarlo | 2020/11/22 14:00 | Rafael Mazon-Hernandez v Stefan Loncar | 5-7,3-6 |
| ITF M15 Parnu | 2020/11/04 08:00 | Stefan Loncar v Mick Veldheer | 4-6,2-6 |
| ITF M15 Opatija | 2021/03/21 08:00 | Milan Radojkovic v Mattia Frinzi | 0-6,1-6 |
| ITF M15 Rovinj | 2021/03/14 08:30 | Josip Krstanovic v Mattia Frinzi | 6-2,7-6 |
| ITF - M15 Porec | 2021/03/09 09:00 | Gergely Madarasz v Mattia Frinzi | 7-5,6-3 |
| ITF - M15 Porec | 2021/03/07 11:00 | Roko Horvat v Mattia Frinzi | 1-6,1-6 |
| ITF M25 Trento | 2020/02/26 12:50 | Mattia Frinzi v Mick Veldheer | 1-6,4-6 |
| ITF M25 Trento | 2020/02/24 11:20 | Mattia Frinzi v Maris Sipkovs | 6-0,6-0 |
| ITF M15 Monastir | 2019/11/30 09:00 | Mattia Frinzi v Jan Šátral | 6-7,3-6 |
| ITF M15 Monastir | 2019/11/29 08:30 | Kai Wehnelt v Mattia Frinzi | 3-6,5-7 |