Stadium: Center Court Round: 27 Ground: Carpet indoor
| ITF Germany F4 | 2015/01/30 12:00 | Ruben Bemelmans v Johannes Haerteis | 6-2,6-3 |
| Challenger Szczecin | 2019/09/11 14:00 | Albert Ramos-Vinolas v Johannes Haerteis | 6-2,6-4 |
| Challenger Szczecin | 2019/09/09 12:00 | Johannes Haerteis v Mathieu Perchicot | 2-6,6-4,6-2 |
| Challenger L'Aquila | 2019/08/24 14:55 | Dmitry Popko v Johannes Haerteis | 7-6,6-2 |
| Challenger L'Aquila | 2019/08/22 09:35 | Juan Pablo Ficovich v Johannes Haerteis | 3-6,6-7 |
| Challenger L'Aquila | 2019/08/21 08:00 | Johannes Haerteis v Nino Serdarusic | 7-6,6-3 |
| Challenger L'Aquila | 2019/08/19 09:40 | Riccardo Bonadio v Johannes Haerteis | 4-6,4-6 |
| Challenger Meerbusch | 2019/08/13 09:40 | Johannes Haerteis v Eduard Esteve Lobato | 6-4,7-5 |
| Challenger Augsburg | 2019/08/06 08:00 | Johannes Haerteis v Louis Wessels | 6-7,5-7 |
| Challenger Istanbul | 2019/09/13 10:45 | Ugo Humbert v Ruben Bemelmans | 6-7,7-5,6-2 |
| Challenger Istanbul | 2019/09/12 08:50 | Ruben Bemelmans v Lukas Rosol | 6-4,6-3 |
| Challenger Istanbul | 2019/09/10 07:00 | Ruben Bemelmans v Mircea-Alexandru Jecan | 6-2,7-5 |
| US Open | 2019/08/22 17:20 | Ruben Bemelmans v Ilya Ivashka | 4-6,3-6 |
| US Open | 2019/08/20 21:45 | Ruben Bemelmans v Hiroki Moriya | 6-1,7-6 |
| Challenger Vancouver | 2019/08/13 17:00 | Ruben Bemelmans v Jason Jung | 4-6,2-6 |
| Challenger Vancouver | 2019/08/12 20:30 | Liam Draxl v Ruben Bemelmans | 4-6,5-7 |
| Challenger Aptos | 2019/08/06 21:25 | Alexander Sarkissian v Ruben Bemelmans | 6-7,6-1,6-2 |