Round: 25 Ground: Clay
| ITF Netherlands F4 | 2015/07/04 08:00 | Anderson, Oliver v Guy Den Heijer | 6-2,7-5 |
| ITF Netherlands F2 Qual | 2015/06/23 10:00 | de Goeijen, Bobby v Guy Den Heijer | 6-4,3-6,7-5 |
| ITF Netherlands F2 Qual | 2015/06/21 09:15 | Guy Den Heijer v de Valk, Roy Sarut | 7-6,7-5 |
| ITF Netherlands F2 Qual | 2015/06/20 08:00 | Griekspoor, Kevin v Guy Den Heijer | 3-6,3-6 |
| ITF Netherlands F1 Qual | 2015/06/13 08:30 | Guy Den Heijer v Does, Thomas | 6-0,6-4 |
| ITF Netherlands F6 | 2015/08/23 12:10 | van Den Honert, Vincent v Willems, Johann | 3-6,1-6 |
| ITF Netherlands F6 | 2015/08/22 08:00 | Hermans, Mats v Willems, Johann | 1-6,4-6 |
| ITF Netherlands F4 | 2015/07/05 08:00 | de Valk, Roy Sarut v Willems, Johann | 7-5,6-7,5-7 |
| ITF Netherlands F4 | 2015/07/04 08:00 | Willems, Johann v Goluza, Ivan | 6-2,6-3 |
| ITF Belgium F3 | 2015/06/24 10:40 | Willems, Johann v Tabatruong, Maxime | 1-6,0-6 |
| ITF Germany F4 | 2015/01/26 10:30 | Vitaliy Sachko v Willems, Johann | 4-6,6-4,6-3 |
| ITF Germany F4 | 2015/01/25 13:30 | Willems, Johann v Paul Woerner | 6-3,6-3 |
| ITF Germany F4 | 2015/01/25 08:00 | Borter, Nico v Willems, Johann | 2-6,3-6 |