Stadium: Centre Court Round: 26 Ground: Clay
| ITF M15 - Kamen | 2019/06/26 16:05 | Valentin Guenther v Peter Heller | 6-4,6-7,1-6 |
| ITF Czech Republic F12 | 2018/11/28 11:35 | Peter Heller v Valentin Guenther | 6-3,6-3 |
| ITF Germany F5 | 2017/06/27 12:40 | Valentin Guenther v Peter Heller | 1-6,4-6 |
| ITF M15 - Ueberlingen | 2019/08/21 09:55 | Peter Heller v Kai Lemstra | 5-7,6-2,6-2 |
| Challenger Augsburg | 2019/08/06 12:55 | Peter Heller v Mario Vilella Martinez | 2-6,2-6 |
| Challenger Augsburg | 2019/08/05 10:55 | Oriol Roca Batalla v Peter Heller | 5-7,7-6,4-6 |
| Challenger Liberec | 2019/07/29 10:25 | Geoffrey Blancaneaux v Peter Heller | 6-3,6-3 |
| Challenger Prag | 2019/07/25 09:30 | Chun Hsin Tseng v Peter Heller | 6-7,6-3,6-3 |
| Challenger Prag | 2019/07/24 08:00 | Peter Heller v Uladzimir Ignatik | 6-1,6-4 |
| Challenger Prag | 2019/07/23 08:00 | Peter Heller v Vit Kopriva | 6-2,6-3 |
| Challenger Braunschweig | 2019/07/07 08:00 | Carlos Taberner v Peter Heller | 7-6,6-1 |
| ITF M15 - Ueberlingen | 2019/08/21 09:35 | Valentin Guenther v Manfred Fellin | 3-6,6-2,6-1 |
| ITF M25 - Kassel | 2019/07/19 12:00 | Sadio Doumbia v Valentin Guenther | 7-5,6-2 |
| ITF M25 - Kassel | 2019/07/18 09:00 | Marek Gengel v Valentin Guenther | 7-6,2-6,4-6 |
| ITF M25 - Kassel | 2019/07/17 09:30 | Valentin Guenther v Fabien Reboul | 6-4,2-6,6-1 |
| ITF M25 - Kassel | 2019/07/16 09:25 | Markus Wunder v Valentin Guenther | 1-6,5-7 |
| ITF M15 - Marburg | 2019/07/11 17:40 | Robin Stanek v Valentin Guenther | 6-1,7-6 |
| ITF M15 - Marburg | 2019/07/10 13:40 | Valentin Guenther v James Frawley | 6-4,7-6 |
| ITF M15 - Marburg | 2019/07/08 09:00 | Valentin Guenther v Jannis Kahlke | 6-4,6-2 |