Stadium: Main Court (7) Round: 44 Ground: Clay
| ITF M25 Poznan | 2020/08/23 09:30 | Dawid Taczala v Adrian Oetzbach | 3-6,2-6 |
| ITF M15 Novi Sad | 2021/07/26 12:00 | Lahky, Nikolas v Atlangeriev, Bekkhan | 3-6,2-6 |
| ITF M15 Novi Sad | 2021/07/25 12:00 | Marko Stakusic v Lahky, Nikolas | 3-6,5-7 |
| ITF M25 Kottingbrunn | 2021/07/18 07:30 | Lahky, Nikolas v Samuel Puskar | 3-6,2-6 |
| ITF M15 Poprad | 2021/07/04 08:00 | Janos Fekete v Lahky, Nikolas | 6-2,7-6 |
| ITF M25 Wroclaw | 2021/06/27 12:30 | Novansky, Michal v Lahky, Nikolas | 6-4,6-4 |
| Sarajevo, Singles Main, M-ITF-BIH-05A | 2021/05/31 12:00 | Trocker, Moritz v Lahky, Nikolas | 6-2,6-1 |
| Sarajevo, Singles Main, M-ITF-BIH-05A | 2021/05/30 10:30 | Lahky, Nikolas v Pjevcevic, Petar | 6-3,7-5 |
| ITF - M15 Bucarest | 2021/05/23 08:30 | Lahky, Nikolas v Filippo Speziali | 3-6,3-6 |