Stadium: Court 1 Round: 19 Ground: Carpet indoor
| ITF Germany F3 | 2016/01/29 12:05 | Uladzimir Ignatik v Johannes Haerteis | 7-5,7-5 |
| ITF Germany F1 | 2015/01/09 15:20 | Uladzimir Ignatik v Johannes Haerteis | 6-7,6-3,6-4 |
| Challenger - Eckental | 2021/10/31 13:30 | Lucas Miedler v Johannes Haerteis | 3-6,7-5,3-6 |
| Challenger - Ismaning | 2021/10/25 11:50 | Otto Virtanen v Johannes Haerteis | 4-6,6-3,6-3 |
| Challenger - Ismaning | 2021/10/24 12:35 | Johannes Haerteis v Tristan Lamasine | 6-4,6-4 |
| ITF - M25 Hamburg | 2021/10/23 10:00 | Henri Squire v Johannes Haerteis | 6-4,6-4 |
| ITF - M25 Hamburg | 2021/10/22 12:10 | Johannes Haerteis v Daniel Little | 6-4,6-4 |
| ITF - M25 Hamburg | 2021/10/21 15:45 | Johannes Haerteis v Leonard Von Hindte | 6-3,6-4 |
| ITF - M25 Hamburg | 2021/10/20 10:50 | Johannes Haerteis v Riccardo Balzerani | 6-3,6-4 |
| ITF - M25 Jonkoping | 2021/09/20 10:45 | Filip Bergevi v Johannes Haerteis | 6-4,7-6 |
| Challenger - Eckental | 2021/10/31 13:00 | Uladzimir Ignatik v Benjamin Hassan | 6-3,6-4 |
| ITF - M25 Nur-Sultan | 2021/10/21 05:00 | Ivan Liutarevich v Uladzimir Ignatik | 1-6,6-4,7-5 |
| ITF - M25 Nur-Sultan | 2021/10/20 08:25 | Igor Trunov v Uladzimir Ignatik | 3-6,3-6 |
| ITF - M25 Praha | 2021/10/08 11:10 | Tobias Simon v Uladzimir Ignatik | 2-6,7-6,6-4 |
| ITF - M25 Praha | 2021/10/07 09:20 | Danylo Kalenichenko v Uladzimir Ignatik | 3-6,6-3,3-6 |
| ITF - M25 Praha | 2021/10/06 08:55 | Stepan Pecak v Uladzimir Ignatik | 3-6,3-6 |
| Challenger - Sibiu | 2021/09/26 07:30 | Uladzimir Ignatik v Oleg Prihodko | 3-6,3-6 |
| Challenger - Bukurešť | 2021/09/20 08:00 | Ivan Gakhov v Uladzimir Ignatik | 0-6,6-2,6-3 |