Stadium: Court 1 Round: 27 Ground: Clay
| Austrian Tennis Championship | 2020/07/27 08:00 | Neil Oberleitner v Lukas Krainer | 0-6,1-6 |
| ITF M15 Bad Waltersdorf | 2021/08/26 09:35 | Tomas Lipovsek Puches v Lukas Krainer | 3-6,4-6 |
| ITF M15 Bad Waltersdorf | 2021/08/25 08:50 | Lukas Krainer v Admir Kalender | 6-4,3-6,6-2 |
| ITF M15 Warmbad-Villach | 2021/08/20 12:50 | Gabriel Decamps v Lukas Krainer | 6-2,6-3 |
| ITF M15 Warmbad-Villach | 2021/08/19 09:55 | Lukas Krainer v Tom Kocevar-Desman | 6-3,7-5 |
| ITF M15 Warmbad-Villach | 2021/08/18 14:35 | Mario G Fernandez v Lukas Krainer | 6-7,6-2,1-6 |
| ITF M15 Cairo | 2021/08/06 09:55 | Lukas Krainer v Quentin Folliot | 4-6,1-6 |
| ITF M15 Cairo | 2021/08/05 09:20 | Lukas Krainer v Constantin Bittoun Kouzmine | 6-1,6-2 |
| ITF M15 Cairo | 2021/08/04 09:10 | Karim-Mohamed Maamoun v Lukas Krainer | 1-6,2-6 |
| ITF M15 Bad Waltersdorf | 2021/08/26 06:55 | Neil Oberleitner v Eric Vanshelboim | 7-6,6-0 |
| ITF M15 Bad Waltersdorf | 2021/08/24 12:40 | Neil Oberleitner v Maximilian Homberg | 6-2,6-2 |
| ITF M15 Warmbad-Villach | 2021/08/19 10:15 | Jakob Aichhorn v Neil Oberleitner | 6-1,4-6,6-4 |
| ITF M15 Warmbad-Villach | 2021/08/18 10:05 | Neil Oberleitner v Savriyan Danilov | 7-5,7-6 |
| ITF M25 Frankfurt am Main | 2021/08/09 09:00 | Lenny Hampel v Neil Oberleitner | 6-4,6-4 |
| ITF M25 Kottingbrunn | 2021/07/21 12:10 | Neil Oberleitner v Toby Martin | 6-7,5-7 |
| ITF M25 Telfs | 2021/07/13 07:30 | Neil Oberleitner v Ondrej Horak | 4-6,4-6 |
| ITF M25 Telfs | 2021/07/12 07:50 | Neil Oberleitner v Jan Jermar | 6-3,6-0 |