| ATP - Sófia | 11/04 18:45 | 14 | [173] Marc-Andrea Huesler v Alexander Erler [41] | 6-1,7-5 | |
| ATP - Viena | 10/21 11:20 | 14 | [61] Emil Ruusuvuori v Alexander Erler [34] | 6-1,7-5 | |
| Challenger - Cagliari | 05/02 08:30 | 19 | [246] Alessandro Giannessi v Alexander Erler [36] | 7-5,6-1 | |
| Challenger - Cagliari | 05/01 09:40 | 14 | [60] Aleksandr Nedovyesov v Alexander Erler [36] | 3-6,6-3,5-7 | |
| Challenger - Helsínquia | 11/14 11:00 | 19 | [239] Mikhail Kukushkin v Alexander Erler [49] | 6-2,7-6 | |
| Challenger - Helsínquia | 11/13 09:00 | 14 | [47] Alexander Erler v Gauthier Onclin [331] | 7-6,7-6 | |
| ATP - Viena | 10/22 10:20 | 14 | [76] Alexander Erler v Joao Sousa [67] | 6-7,5-7 | |
| ATP - Antuérpia | 10/17 10:00 | 19 | [113] Tim Van Rijthoven v Alexander Erler [76] | 7-6,6-3 | |
| ATP - Antuérpia | 10/16 10:00 | 14 | [78] Alexander Erler v Evan Furness [202] | 6-1,6-4 | |
| Challenger - Sibiu | 09/19 11:00 | 19 | [376] Rudolf Molleker v Alexander Erler [71] | 6-1,6-1 | |
| Challenger - Sibiu | 09/18 14:05 | 14 | [72] Alexander Erler v Marko Topo [471] | 7-5,6-3 | |
| Challenger - Tulln | 09/04 13:35 | 14 | [229] Filip Horansky v Alexander Erler [83] | 3-6,6-3,6-2 | |
| Challenger - Grodzisk Mazowiecki | 08/14 11:10 | 14 | [403] Beibit Zhukayev v Alexander Erler [87] | 6-7,6-3,6-3 | |
| Challenger - Liberec | 07/31 09:20 | 14 | Denis Yevseyev v Alexander Erler | Cancelled | |
| Challenger Iasi | 07/10 15:00 | 14 | Ilya Snitari v Alexander Erler | 6-3,6-3 | |
| Challenger - Salzburgo | 07/03 13:00 | 14 | Alexander Erler v Filip C Jianu | Cancelled | |
| Challenger - Prostejov | 05/31 12:45 | 25 | [467] Alexander Erler v Lukas Klein [327] | 4-6,0-6 | |
| Challenger - Prostejov | 05/30 08:00 | 19 | Giovanni M Perricard v Alexander Erler | 5-7,2-6 | |
| Challenger - Prostejov | 05/29 08:00 | 14 | [467] Alexander Erler v Juncheng Shang [401] | 4-6,7-6,6-4 | |
| Challenger - Túnis | 05/18 11:30 | 26 | [319] Oriol Roca Batalla v Alexander Erler [479] | 7-5,7-6 | |
| Challenger - Túnis | 05/17 09:00 | 25 | [479] Alexander Erler v Kimmer Coppejans [278] | 7-6,7-6 | |
| Challenger - Túnis | 05/16 12:45 | 19 | [357] Adrian Menendez-Maceiras v Alexander Erler [479] | 1-6,7-6,6-7 | |
| Challenger - Túnis | 05/15 13:45 | 14 | Youssef Labbene v Alexander Erler | 7-6,2-6,6-7 | |
| ITF - M15 Cairo | 05/11 08:00 | 25 | Alexander Erler v Max Alcala Gurri | 4-6,1-6 | |
| Challenger - Mauthausen | 05/01 13:35 | 14 | [301] Lukas Klein v Alexander Erler [446] | 4-6,6-0,6-3 | |
| Challenger - Ostrava | 04/25 11:00 | 19 | [249] Lukas Rosol v Alexander Erler [446] | 6-2,6-0 | |
| Challenger - Ostrava | 04/24 10:55 | 14 | Ondrej Horak v Alexander Erler | 7-6,2-6,3-6 | |
| Challenger - Praga | 04/17 08:30 | 14 | [403] Sebastian Fanselow v Alexander Erler [395] | 6-1,7-5 | |
| Challenger - Bienna | 03/20 13:55 | 14 | [315] Andrew Paulson v Alexander Erler [371] | 7-5,6-3 | |
| Challenger - Bengaluru - Qualificação | 02/13 08:40 | 14 | Dominik Palan v Alexander Erler | 7-6,4-6,6-3 |