Stadium: Court 5 Round: 44 Ground: Clay
| German Premier League | 2020/08/15 11:00 | Altug Celikbilek v Robert Strombachs | 4-6,3-6 |
| German Premier League | 2020/08/14 14:50 | Robert Strombachs v Adrian Oetzbach | 6-0,6-4 |
| German Premier League | 2020/08/13 10:45 | Benjamin Lock v Robert Strombachs | 4-6,1-6 |
| German Premier League | 2020/08/12 17:15 | Walder, Jim v Robert Strombachs | 6-7,2-6 |
| German Premier League | 2020/08/11 10:50 | Robert Strombachs v Yanki Erel | 1-6,2-6 |
| German Premier League | 2020/08/10 17:20 | Elmar Ejupovic v Robert Strombachs | 6-2,6-4 |
| German Premier League | 2020/08/08 09:00 | Robert Strombachs v Vladyslav Orlov | 6-1,6-4 |
| German Premier League | 2020/08/07 13:00 | Mats Rosenkranz v Robert Strombachs | 6-1,6-7,6-4 |
| ITF - M15 Porec | 2020/03/10 11:10 | Jotovski, Tomislav v Loncar, Stefan | 6-1,6-2 |
| ITF - M15 Porec | 2020/03/09 10:30 | Loncar, Stefan v van Beem, Colin | 6-2,3-6,10-6 |
| ITF - M15 Porec | 2020/03/08 13:35 | Loncar, Stefan v Sodan, Ivan | 6-3,6-1 |
| ITF - M15 Antalya | 2020/02/16 09:30 | Loncar, Stefan v Andrea Fiorentini | 4-6,2-6 |
| ITF - M15 Antalya | 2020/02/11 08:30 | Tacchi, Luciano v Loncar, Stefan | 6-1,6-0 |
| ITF - M15 Monastir | 2019/12/16 08:00 | Ratsaratany, Loic v Loncar, Stefan | 6-4,6-2 |
| ITF - M15 Monastir | 2019/12/16 08:00 | Loncar, Stefan v Maxim Krapivin | 6-3,6-4 |
| Monastir, Singles Qualifying M-ITF-TUN-52A | 2019/12/09 09:00 | Coppini, Alessandro v Loncar, Stefan | 4-6,6-0,10-7 |