Stadium: Court 1 Round: 25 Ground: Clay
| 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 Kamen | 2019/06/24 12:00 | Guenther, Valentin v Bybel, Nicholas | 6-4,6-2 |
| ITF M15 Kamen | 2019/06/24 08:00 | Guenther, Valentin v Tarasevicius, Tadas | 6-1,6-2 |
| ITF - M15 Héraklion | 2019/05/30 07:00 | Crepaldi, Erik v Guenther, Valentin | 5-7,6-0,6-3 |
| ITF - M15 Héraklion | 2019/05/29 07:00 | Guenther, Valentin v Vivero Gonzalez, Pablo | 7-6,7-5 |
| ITF - M15 Héraklion | 2019/05/22 13:05 | Cayre, Paul v Guenther, Valentin | 7-6,6-2 |
| ITF - M15 Héraklion | 2019/05/20 13:00 | Guenther, Valentin v Adam Jones | 7-6,6-0 |
| ITF - M15 Héraklion | 2019/05/16 08:20 | Bothwell, Peter v Guenther, Valentin | 6-2,6-2 |
| ITF - M15 Héraklion | 2019/05/15 11:45 | Boris Pokotilov v Guenther, Valentin | 6-7,6-3,3-6 |
| Challenger Bratislava | 2019/06/17 09:30 | Peter Heller v Vanneste, Jeroen | 4-6,4-6 |
| Lyon, France | 2019/06/10 14:45 | Peter Heller v Manuel Guinard | 6-7,6-1,3-6 |
| ITF M25 Jablonec Nad Nisou | 2019/05/23 15:00 | Peter Heller v Torebko, Peter | 6-3,6-7,1-6 |
| Challenger Heilbronn | 2019/05/15 09:30 | Bachinger, Matthias v Peter Heller | 6-3,6-3 |
| Challenger Heilbronn | 2019/05/14 09:30 | Peter Heller v Krawietz, Kevin | 6-3,6-2 |
| Challenger - Rome | 2019/05/07 12:40 | Peter Heller v Henri Laaksonen | 2-6,1-6 |
| Challenger - Rome | 2019/05/06 10:10 | Peter Heller v Jacq, Gregoire | 6-3,6-3 |
| Challenger - Ostrava | 2019/05/01 12:50 | Norbert Gombos v Peter Heller | 6-4,7-5 |