Ground: Clay
| ITF Netherlands F3 | 2015/07/01 10:00 | Neis, Fabricio v Mertens, Yannick | 6-2,4-6,7-6 |
| ITF Netherlands F3 | 2015/06/30 16:25 | Willekes Macdonald, Robert v Mertens, Yannick | 4-6,2-6 |
| Wimbledon Qual | 2015/06/24 14:45 | Mertens, Yannick v Mathias Bourgue | 6-7,6-3,6-2 |
| Wimbledon Qual | 2015/06/23 10:00 | Krajicek, Austin v Mertens, Yannick | 4-6,6-2,5-7 |
| Challenger Blois | 2015/06/15 16:10 | Mertens, Yannick v Gonzalez, Alejandro | 4-6,2-6 |
| Challenger Caltanissetta | 2015/06/09 09:00 | Mertens, Yannick v Gonzalez, Alejandro | 2-6,3-6 |
| Challenger - Ostrava | 2015/04/27 15:25 | Mertens, Yannick v Pedro Cachin | 3-6,4-6 |
| Challenger St Brieuc | 2015/04/09 11:30 | Sugita, Yuichi v Mertens, Yannick | 6-0,6-3 |
| ITF Netherlands F3 | 2015/07/01 10:00 | Niesten, Miliaan v Prashanth, N. Vijay Sundar | 6-3,4-6,3-6 |
| ITF Netherlands F3 | 2015/06/30 14:10 | van Den Berg, Bart v Niesten, Miliaan | 6-7,4-6 |
| ITF Netherlands F2 | 2015/06/24 11:00 | Niesten, Miliaan v de Goeijen, Bobby | 6-2,7-6 |
| ITF Israel F3 | 2015/03/25 13:10 | Goldengoren, Tal v Niesten, Miliaan | 7-5,6-3 |
| ITF Israel F3 | 2015/03/24 11:55 | Niesten, Miliaan v Smith, Raleigh | 7-6,5-7,6-1 |
| ITF Turkey F7 | 2015/02/18 09:30 | Gleb Sakharov v Niesten, Miliaan | 6-2,6-4 |
| Turkey F6, Singles Qualifying | 2015/02/16 08:30 | Niesten, Miliaan v Dimitar Kuzmanov | 6-2,6-3 |
| Turkey F6, Singles Qualifying | 2015/02/14 08:30 | Niesten, Miliaan v Merckx, Jonas | 6-4,6-3 |