| Challenger Bengaluru | 02/07 06:05 | 19 | [206] Arjun Kadhe v Alexander Erler [350] | 6-3,6-4 | |
| Challenger Bengaluru | 02/06 10:40 | 14 | Manish Sureshkumar v Alexander Erler | 2-6,4-6 | |
| Challenger Forli - Kval | 01/16 12:55 | 14 | [353] Alexander Erler v Lucas Miedler [290] | 1-6,3-6 | |
| Challenger Maia | 12/14 14:40 | 25 | [342] Alexander Erler v Fabian Marozsan [376] | 1-6,2-6 | |
| Challenger Forli | 12/06 15:25 | 25 | [340] Alexander Erler v Vitaliy Sachko [255] | 6-3,2-6,2-6 | |
| Challenger Forli | 11/28 12:00 | 14 | Alexander Erler v Valentin Vacherot | 3-6,2-6 | |
| Challenger Manama | 11/23 11:40 | 25 | [463] Johannes Haerteis v Alexander Erler [339] | 6-3,6-4 | |
| Challenger Ortisei | 11/07 14:10 | 14 | [325] Alexander Erler v Alexander Cozbinov [277] | Retired | |
| Challenger Eckental | 11/02 13:15 | 25 | Henri Squire v Alexander Erler | 7-6,2-6,7-6 | |
| Challenger Eckental | 11/01 10:00 | 19 | Alexander Erler v Henri Squire | 4-6,2-6 | |
| Challenger Eckental | 10/31 10:35 | 14 | [327] Alexander Erler v Artem Dubrivnyy [472] | 6-1,6-3 | |
| ATP Wien | 10/23 09:00 | 14 | [328] Alexander Erler v Gianluca Mager [67] | 7-6,2-6,4-6 | |
| Challenger Sibiu | 09/28 07:00 | 25 | Alexander Erler v Geoffrey Blancaneaux | Cancelled | |
| Challenger Bukarest | 09/20 11:20 | 25 | [260] Vitaliy Sachko v Alexander Erler [329] | 6-2,6-2 | |
| Challenger Tulln | 09/06 12:10 | 25 | [327] Alexander Erler v Lukas Rosol [236] | 4-6,7-5,1-6 | |
| Challenger Como | 08/31 08:00 | 25 | [307] Riccardo Bonadio v Alexander Erler [327] | 3-6,6-3,6-3 | |
| Challenger Como | 08/30 09:00 | 19 | [319] Filippo Baldi v Alexander Erler [327] | 6-7,4-6 | |
| Challenger Como | 08/29 11:45 | 14 | Marcello Serafini v Alexander Erler | 1-6,6-3,6-7 | |
| Challenger Warszawa | 08/25 12:40 | 25 | [292] Nicolas Kicker v Alexander Erler [323] | 2-6,7-5,6-3 | |
| ATP Kitzbühel | 07/28 14:50 | 26 | [99] Mikael Ymer v Alexander Erler [337] | 6-2,6-3 | |
| ATP Kitzbühel | 07/27 15:00 | 25 | [337] Alexander Erler v Carlos Alcaraz [55] | 7-5,1-6,6-2 | |
| ATP Kitzbühel | 07/26 08:00 | 25 | Alexander Erler v Aljaz Bedene | Cancelled | |
| Challenger Tampere | 07/21 09:00 | 26 | [327] Geoffrey Blancaneaux v Alexander Erler [339] | 6-3,4-6,6-2 | |
| Challenger Tampere | 07/20 10:30 | 25 | [235] Gastao Elias v Alexander Erler [339] | 4-6,6-3,5-7 | |
| Challenger Tampere | 07/19 12:25 | 19 | [339] Alexander Erler v Bogdan Bobrov [439] | 6-4,5-7,1-6 | |
| Challenger Tampere | 07/18 09:45 | 14 | Alexander Erler v Eero Vasa | 6-2,3-6,6-2 | |
| Challenger Salzburg | 07/06 10:10 | 25 | [317] Alexey Vatutin v Alexander Erler [334] | 2-6,6-4,6-2 | |
| Challenger Salzburg | 07/05 09:00 | 19 | [400] Jeroen Vanneste v Alexander Erler [334] | 4-6,2-6 | |
| Challenger Salzburg | 07/04 09:15 | 14 | [444] Sadio Doumbia v Alexander Erler [334] | 6-7,5-7 | |
| ITF M25 - Klosters | 06/24 07:00 | 26 | [334] Alexander Erler v Nicolas Moreno De Alboran [516] | 1-6,5-7 |