Stadium: Court 2 Round: 54 Ground: Hardcourt indoor
| ITF M15 Monastir | 2021/08/01 08:00 | Raffael Schaer v Tadas Tarasevicius | 4-6,0-6 |
| ITF M15 Monastir | 2021/07/26 09:00 | Raffael Schaer v Joshua Sheehy | 2-6,3-6 |
| ITF M25 Kottingbrunn | 2021/07/20 08:00 | Raffael Schaer v Peter Makk | 3-6,1-6 |
| ITF M25 Kottingbrunn | 2021/07/19 09:30 | Petros Tsitsipas v Raffael Schaer | 3-6,4-6 |
| ITF M15 Monastir | 2021/02/28 08:00 | Raffael Schaer v Vladislav Melnic | 6-7,2-6 |
| ITF M15 Monastir | 2021/02/21 11:00 | Bruno P Navarro v Raffael Schaer | 6-1,6-0 |
| ITF M15 Monastir | 2021/02/15 10:00 | Raffael Schaer v Taiyo Yamanaka | 4-6,4-6 |
| ITF M15 Monastir | 2021/02/14 10:00 | Louis Herman v Raffael Schaer | 4-6,5-7 |
| ITF M15 Frederiksberg | 2021/08/01 08:00 | Adam Heinonen v Nikolaj Katic | 6-3,6-7,10-6 |
| UTR Pro Tennis Series Copenhagen | 2021/06/19 07:00 | Nikolaj Katic v Warren Sinius | 4-5 |
| UTR Pro Tennis Series Copenhagen | 2021/06/18 11:00 | Benjamin Hannestad v Nikolaj Katic | 6-4,6-1 |
| UTR Pro Tennis Series Copenhagen | 2021/06/17 08:00 | Daniel De Jonge v Nikolaj Katic | 4-6,6-4,6-0 |
| ITF Turkey F3 | 2018/01/20 09:00 | Nikolaj Katic v Roberts Grinvalds | 0-6,4-6 |
| ITF Turkey F1 | 2018/01/07 08:30 | Zizou Bergs v Nikolaj Katic | 6-2,6-1 |
| ITF Turkey F1 | 2018/01/06 09:00 | Philipp Sikorski v Nikolaj Katic | 2-6,6-1,2-6 |
| ITF Turkey F47 Qual | 2017/12/09 06:45 | Gregorio Cordonnier v Nikolaj Katic | 6-7,6-4,6-2 |