Stadium: Court 2 Round: 54 Ground: Clay
| ITF M25 Wetzlar | 2021/08/05 09:00 | Hampel, Lenny v Alexey Vatutin | 2-6,2-6 |
| ITF M25 Wetzlar | 2021/08/04 13:10 | Hampel, Lenny v Torski, Osman | 6-4,7-5 |
| ITF M25 Kottingbrunn | 2021/07/24 10:00 | Francisco Comesana v Hampel, Lenny | 6-3,7-5 |
| ITF M25 Kottingbrunn | 2021/07/23 08:30 | Apostol, Bogdan Ionut v Hampel, Lenny | 1-6,6-4,5-7 |
| ITF M25 Kottingbrunn | 2021/07/22 09:40 | Hampel, Lenny v David Pichler | 7-6,6-2 |
| ITF M25 Kottingbrunn | 2021/07/21 08:00 | Manda, Calin v Hampel, Lenny | 4-6,5-7 |
| ITF M25 Telfs | 2021/07/14 07:55 | Filip Misolic v Hampel, Lenny | 6-4,6-7,6-4 |
| ITF M25 Velenje | 2021/07/09 10:55 | Rodriguez, Cristian v Hampel, Lenny | 6-4,4-6,6-4 |
| 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 |
| Sibenik, Singles M-ITF-CRO-05A | 2021/04/19 08:00 | Christian Sigsgaard v Neil Oberleitner | 7-6,6-4 |
| Sibenik, Singles M-ITF-CRO-05A | 2021/04/18 08:00 | Matic Dimic v Neil Oberleitner | 7-6,4-6,6-10 |
| ITF - M15 Sharm El Sheikh | 2021/04/06 08:55 | Neil Oberleitner v Adam Jones | 2-6,6-1,8-10 |
| ITF - M15 Sharm El Sheikh | 2021/04/05 11:30 | Neil Oberleitner v Troche, Emiliano | 6-0,6-1 |
| ITF - M15 Sharm El Sheikh | 2021/03/28 14:30 | Lorenzo Rottoli v Neil Oberleitner | 6-1,3-6,10-8 |