Stadium: Court 4 Round: 62 Ground: Clay
| 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 |
| Sibenik, Singles M-ITF-CRO-05A | 2021/04/18 08:00 | Lahky, Nikolas v Mayeul Darras | 5-7,7-6,4-10 |
| ITF M25 Idanha-A-Nova | 2021/07/12 11:35 | Daniel Little v Atlangeriev, Bekkhan | 6-2,4-6,10-2 |
| ITF M25 Idanha-A-Nova | 2021/07/11 10:30 | Rodeia, Andre v Atlangeriev, Bekkhan | 6-7,6-7 |
| ITF M15 Sofia | 2021/07/04 06:30 | Turcu, Mihnea Lorin Stefan v Atlangeriev, Bekkhan | 6-1,6-4 |
| ITF M25 Belgrade | 2021/06/28 07:00 | Viktor Jovic v Atlangeriev, Bekkhan | 6-4,6-4 |
| ITF M15 Helsinki | 2021/06/01 07:00 | Atlangeriev, Bekkhan v Saar, Karl Kiur | 2-6,6-2,9-11 |
| ITF M15 Kouvola | 2021/05/26 06:00 | Anton Matusevich v Atlangeriev, Bekkhan | 6-2,6-3 |
| ITF M15 St Petersburg Qual | 2021/02/07 13:55 | Evgeny Philippov v Atlangeriev, Bekkhan | 6-3,6-3 |
| ITF M15 St Petersburg | 2021/01/31 08:00 | Maxim Krapivin v Atlangeriev, Bekkhan | 7-6,3-6,10-6 |