Ground: Carpet indoor
| ITF M15 Haren | 2022/08/29 15:00 | Niels Lootsma v Philipp Pavlenko | 7-6,1-6,1-10 |
| ITF M25 Oldenzaal | 2022/08/24 13:45 | Niels Lootsma v Mathys Erhard | 2-6,1-6 |
| ITF M25 Oldenzaal | 2022/08/22 16:00 | Niels Lootsma v Rik Muller | 6-4,6-4 |
| ITF M25 Oldenzaal | 2022/08/21 13:00 | Niels Lootsma v Daniel Verbeek | 6-1,6-4 |
| ITF M15 Oldenzaal | 2021/08/18 16:50 | Niklas Guttau v Niels Lootsma | 3-6,2-6 |
| ITF M15 Cairo | 2019/12/14 08:00 | Manuel Guinard v Niels Lootsma | 6-1,6-0 |
| ITF M15 Cairo | 2019/12/13 09:05 | Niels Lootsma v Alex Marti Pujolras | 4-6,6-3,6-4 |
| ITF M15 Cairo | 2019/12/12 09:00 | Niels Lootsma v Jaime Caldes | 6-2,3-6,6-0 |
| UTR Pro Tennis Series Portoroz | 2021/08/26 07:00 | Nik Razborsek v Volodymyr Uzhylovskyi | 6-3,5-7,5-7 |
| UTR Pro Tennis Series Portoroz | 2021/08/25 10:00 | Nik Razborsek v Vladan Tadic | 1-6,4-6 |
| UTR Pro Tennis Series Portoroz | 2021/08/25 07:00 | Nik Razborsek v Domen Gostincar | 2-0 |
| UTR Pro Tennis Series Portoroz | 2021/08/24 08:30 | Nik Razborsek v Olexiy Kolisnyk | 5-7,6-2,2-6 |
| Davis Cup | 2020/03/08 12:00 | Aisam-Ul-Haq Qureshi v Nik Razborsek | 4-6,7-5,7-6 |
| ITF M15 Trnava | 2020/02/27 14:25 | Danylo Kalenichenko v Nik Razborsek | 6-4,6-4 |
| ITF M15 Trnava | 2020/02/25 11:30 | Nik Razborsek v Andrew Paulson | 7-5,6-4 |
| ITF M15 Antalya | 2020/01/22 08:45 | Nik Razborsek v Marlon Vankan | 1-6,3-6 |