Stadium: Court 1 Round: 54 Ground: Clay
| UTR Pro Kopenhaagen | 2023/06/02 13:17 | Gustav Theilgaard v Philip Hjorth | 6-7,4-6 |
| UTR Pro Kopenhaagen | 2023/05/31 07:30 | Gustav Theilgaard v Oliver Valentinsson | 6-4,6-4 |
| UTR Pro Kopenhaagen | 2023/05/30 06:00 | Gustav Theilgaard v Adam Kresina | 6-0,7-5 |
| UTR Pro Kopenhaagen | 2023/05/29 09:35 | Gustav Theilgaard v Adamantios Stavrakas | 6-3,3-6,6-1 |
| UTR Pro Kopenhaagen | 2023/05/28 08:52 | Gustav Theilgaard v Oskar Brostrom Poulsen | 6-4,6-1 |
| UTR Pro Tennis Series Copenhagen | 2021/06/20 11:00 | Jesper Klov Nilsson v Gustav Theilgaard | 3-6,0-3 |
| UTR Pro Tennis Series Copenhagen | 2021/06/19 11:30 | Gustav Theilgaard v Hugo Pierre | 6-4,7-5 |
| UTR Pro Tennis Series Copenhagen | 2021/06/18 08:00 | Sebastian Grundtvig Jorgensen v Gustav Theilgaard | 6-4,6-2 |
| ITF M15 Kalmar | 2023/05/15 10:30 | Olle Noltorp v Nikolaj Katic | 7-6,6-0 |
| UTR Pro Kopenhaagen | 2023/02/16 07:32 | Nikolaj Katic v Artem Podorozhnyi | 3-6,0-0 |
| UTR Pro Kopenhaagen | 2023/02/15 10:00 | Nikolaj Katic v Yanais Laurent | 3-6,1-6 |
| UTR Pro Kopenhaagen | 2023/02/14 11:30 | Nikolaj Katic v Meethre Barot | 3-6,3-6 |
| UTR Pro Kopenhaagen | 2023/02/13 11:30 | Nikolaj Katic v Nazim Makhlouf | 1-6,4-6 |
| ITF M15 Danderyd | 2022/09/20 09:25 | Filip Stidell v Nikolaj Katic | 6-3,6-3 |
| ITF M15 Danderyd | 2022/09/19 13:05 | Anton Krondell v Nikolaj Katic | 3-6,3-6 |
| ITF M25 Lesa | 2022/08/21 12:40 | Nikolaj Katic v Stefano D'Agostino | 2-6,3-6 |