Stadium: Central Hard Court Round: 26 Ground: Hardcourt outdoor
| ITF Austria F1 | 2017/07/05 12:00 | Hampel, Lenny v Erler, Alexander | 4-6,6-4,6-3 |
| ITF - M15 Héraklion | 2019/11/05 08:30 | Erler, Alexander v Michael Zhu | 6-3,2-6,6-2 |
| ATP Vienna | 2019/10/19 09:00 | Cameron Norrie v Erler, Alexander | 6-4,6-2 |
| ITF M25 Norman | 2019/10/02 16:20 | Cozbinov, Alexander v Erler, Alexander | 7-6,3-6,6-4 |
| ITF M25 Harlingen | 2019/09/26 01:40 | Erler, Alexander v Smith, Logan | 1-6,3-6 |
| ITF M25 Harlingen | 2019/09/25 18:30 | Erler, Alexander v Smith, Logan | 1-6,3-5 |
| Columbus III, USA | 2019/09/18 18:50 | Erler, Alexander v Torpegaard, Mikael | 2-6,7-6,1-6 |
| Columbus III, USA | 2019/09/17 15:40 | Colin Sinclair v Erler, Alexander | 5-7,6-7 |
| Challenger Banja Luka | 2019/09/10 08:00 | Camilo Ugo Carabelli v Erler, Alexander | 6-4,3-6,6-3 |
| ITF - M15 Héraklion | 2019/11/06 12:55 | Ivanov, Simon Anthony v Hampel, Lenny | 6-7,0-6 |
| ITF M15 Cairo | 2019/09/27 08:00 | Roncalli, Simone v Hampel, Lenny | 6-2,6-4 |
| ITF M15 Cairo | 2019/09/26 08:00 | Hampel, Lenny v Alexander Weis | 7-5,6-4 |
| ITF M15 Cairo | 2019/09/25 08:00 | Hampel, Lenny v Nabatchikov, Daniil | 6-0,6-0 |
| ITF M15 Cairo | 2019/09/20 10:10 | Perchicot, Mathieu v Hampel, Lenny | 6-4,6-7,6-2 |
| ITF M15 Cairo | 2019/09/18 13:55 | Makhlouf, Sherif v Hampel, Lenny | 4-6,6-7 |
| ITF M15 Cairo | 2019/09/14 08:00 | Voronin, Dimitriy v Hampel, Lenny | 7-6,6-2 |
| ITF M15 Cairo | 2019/09/13 08:00 | Battaglino, Stefano v Hampel, Lenny | 2-6,3-6 |