Stadium: Court 1 Round: 45 Ground: Clay
| Challenger Como | 2018/08/26 11:40 | de Greef, Arthur v Gianluca Mager | 4-6,6-4,1-6 |
| Challenger Como | 2018/08/25 15:25 | de Greef, Arthur v Di Nicola, Gianluca | 7-6,7-5 |
| Challenger Meerbusch | 2018/08/13 15:45 | Bernabe Zapata Miralles v de Greef, Arthur | 6-4,6-2 |
| Pullach, Germany | 2018/08/07 09:00 | de Greef, Arthur v Kimmer Coppejans | 2-6,7-5,1-6 |
| Challenger Pullach Qual | 2018/08/06 10:00 | de Greef, Arthur v Gianluca Mager | 4-6,6-7 |
| Challenger Pullach Qual | 2018/08/05 10:00 | de Greef, Arthur v Juan Pablo Paz | 6-4,3-6,6-1 |
| Challenger Pullach Qual | 2018/08/04 09:00 | de Greef, Arthur v Pena Lopez, Manuel | 6-7,6-3,7-5 |
| Challenger Padova | 2018/07/26 08:30 | de Greef, Arthur v Pavic, Ante | 4-6,7-6,4-6 |
| Challenger Como | 2018/08/25 13:35 | Daniel Masur v Haider-Maurer, Andreas | 3-6,6-2,6-3 |
| Challenger Meerbusch | 2018/08/14 13:45 | Haider-Maurer, Andreas v Jan Choinski | 1-6,4-6 |
| Challenger Pullach Qual | 2018/08/05 11:50 | Haider-Maurer, Andreas v von Massow, George | 5-7,6-7 |
| Challenger Pullach Qual | 2018/08/04 13:45 | Haider-Maurer, Andreas v Sebastian Fanselow | 6-3,7-5 |
| Challenger Liberec Qual | 2018/07/28 14:00 | von Massow, George v Haider-Maurer, Andreas | 3-6,6-3,6-2 |
| Challenger Padova Qual | 2018/07/21 11:30 | Haider-Maurer, Andreas v Kanar, Jonathan | 7-5,4-6,6-7 |
| Challenger Marburg Qual | 2018/07/01 09:00 | Dima, Dragos v Haider-Maurer, Andreas | 6-4,6-3 |
| Challenger Marburg Qual | 2018/06/30 10:35 | Diarra, Gibril v Haider-Maurer, Andreas | 3-6,5-7 |