Stadium: Court 5 Ground: Clay
| ITF Austria F2 | 2018/07/12 11:15 | Alexandar Lazarov v Johannes Haerteis | 3-6,2-6 |
| ITF M25 Vogau | 2020/08/18 09:35 | Kacper Zuk v Johannes Haerteis | 7-5,6-3 |
| Tennis Point Exhibition Series | 2020/08/01 08:00 | Hazem Naw v Johannes Haerteis | 4-6,4-6 |
| Tennis Point Exhibition Series | 2020/07/31 08:00 | Constantin Schmitz v Johannes Haerteis | 0-6,3-6 |
| Tennis Point Exhibition Series | 2020/07/30 11:00 | Daniel Vishnick v Johannes Haerteis | 5-7,4-6 |
| Tennis Point Exhibition Series | 2020/07/29 11:10 | Luca Gelhardt v Johannes Haerteis | 4-6,3-6 |
| Tennis Point Exhibition Series | 2020/07/28 11:15 | Johannes Haerteis v Benjamin Hassan | 4-6,2-6 |
| Tennis Point Exhibition Series | 2020/07/25 08:00 | Daniel Vishnick v Johannes Haerteis | 3-6,3-6 |
| Tennis Point Exhibition Series | 2020/07/24 08:00 | Constantin Schmitz v Johannes Haerteis | 2-6,2-6 |
| Eastern European Championship | 2020/07/22 12:00 | Alexandar Lazarov v Ergi Kirkin | 6-3,0-6,6-1 |
| Eastern European Championship | 2020/07/20 16:55 | Damir Dzumhur v Alexandar Lazarov | 6-1,6-3 |
| Eastern European Championship | 2020/07/17 12:10 | Matias Zukas v Alexandar Lazarov | 5-7,1-6 |
| Eastern European Championship | 2020/07/16 12:10 | Alexandar Lazarov v Vladan Tadic | 6-3,6-0 |
| Eastern European Championship | 2020/07/14 16:00 | Alexandar Lazarov v Boris Butulija | 6-1,6-1 |
| Eastern European Championship | 2020/07/13 10:00 | Alexandar Lazarov v Matej Sabanov | 6-3,6-3 |
| Eastern European Championship | 2020/06/25 17:55 | Nerman Fatic v Alexandar Lazarov | 6-4,6-3 |
| Eastern European Championship | 2020/06/24 16:00 | Alexandar Lazarov v Hamad Medjedovic | 4-6,7-6,7-5 |