| UTR Pro Tennis Series - København | 2021/10/24 10:00 | Alexander Stage v Simon Lander Raagaard | 6-7,6-3,5-6 |
| UTR Pro Tennis Series - København | 2021/10/23 12:30 | Felipe Mikkelsen v Alexander Stage | 1-6,3-5 |
| UTR Pro Tennis Series - København | 2021/10/22 08:30 | Alexander Stage v Simon Friis Soendergaard | 1-6,1-5 |
| UTR Pro Tennis Series - København | 2021/10/21 08:30 | Alexander Stage v Marius Ruzgas | 2-6,2-6 |
| UTR Pro Tennis Series - København | 2021/10/20 10:00 | Drew Van Orderlain v Alexander Stage | 6-4,3-6,6-3 |
| UTR Pro Tennis Series - København | 2021/10/19 07:00 | Adam Heinonen v Alexander Stage | 6-3,6-3 |
| UTR Pro Tennis Series Hillerød | 2022/02/16 15:00 | Sergio Redondo v Frederik Nielsen | 0-6,1-6 |
| UTR Pro Tennis Series Hillerød | 2022/02/14 11:00 | Kevin Chahoud v Frederik Nielsen | 6-4,6-7,0-6 |
| ATP - Doha | 2021/03/06 09:00 | Frederik Nielsen v Ramkumar Ramanathan | 4-6,1-6 |
| Tennis Point Exhibition Series | 2020/07/18 11:35 | Sebastian Mortier v Frederik Nielsen | 4-6,3-6 |
| Tennis Point Exhibition Series | 2020/07/17 09:25 | Sebastian Fanselow v Frederik Nielsen | 6-3,6-7,2-6 |
| Tennis Point Exhibition Series | 2020/07/16 11:45 | Dominik Fritsche v Frederik Nielsen | 1-6,2-6 |
| Tennis Point Exhibition Series | 2020/07/15 14:05 | Julien Penzlin v Frederik Nielsen | 2-6,1-6 |
| Tennis Point Exhibition Series | 2020/07/14 09:50 | Julian Worn v Frederik Nielsen | 3-6,1-6 |