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