| Challenger Series TT | 2023/01/31 11:30 | Makoto Nogami v Nikola Grujic | L | 3-2 |
| Challenger Series TT | 2023/01/31 07:30 | Florian Bluhm v Nikola Grujic | L | 3-0 |
| Challenger Series TT | 2023/01/30 19:30 | Nikola Grujic v Guilherme Teodoro | L | 1-3 |
| Challenger Series TT | 2023/01/30 16:10 | Nikola Grujic v Samuel Amann | W | 3-0 |
| Challenger Series TT | 2023/01/30 14:10 | Josip Huzjak v Nikola Grujic | L | 3-1 |
| Challenger Series TT | 2023/01/30 11:30 | Albert Vilardell v Nikola Grujic | L | 3-0 |
| Challenger Series TT | 2023/01/30 08:50 | Damian Zech v Nikola Grujic | W | 0-3 |
| Challenger Series TT | 2022/12/16 10:50 | Nikola Grujic v Peter Hribar | L | 1-3 |