| 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 |
| UTR Pro Tennis Series Copenhagen | 2021/06/17 11:00 | Henrik Atlevi v Gustav Theilgaard | 5-7,2-6 |
| UTR Pro Tennis Series Copenhagen | 2021/06/15 08:22 | Maxim Landa v Gustav Theilgaard | 7-5,6-4 |
| UTR Pro Kopenhaagen | 2023/05/30 06:00 | Oskar Brostrom Poulsen v Oliver Valentinsson | 7-6,5-7,3-6 |
| UTR Pro Kopenhaagen | 2023/05/28 06:00 | Adamantios Stavrakas v Oliver Valentinsson | 7-6,1-6,6-3 |