Stadium: Carrasco Lawn Tennis Club Round: 3
| ATP Halle MD | 2019/06/19 11:55 | Kubot L / Melo M v Koolhof W / Middelkoop M | 6-3,6-2 |
| Wimbledon MD | 2017/07/05 16:20 | Kubot L / Melo M v Koolhof W / Middelkoop M | 6-4,6-0,6-3 |
| Antalya, Turkey, Doubles | 2017/06/27 15:35 | Koolhof W / Middelkoop M v Paes L / Shamasdin A | 6-3,5-7,9-11 |
| ATP Halle Qual MD | 2017/06/17 14:34 | Haase/Tomic v Koolhof W / Middelkoop M | 7-6,6-5 |
| s-Hertogenbosch, Netherlands, Doubles | 2017/06/13 16:25 | Koolhof W / Middelkoop M v Martin F / Nestor D | 1-6,7-6,9-11 |
| Open de France - Doubles Hommes | 2017/05/31 09:00 | Koolhof W / Middelkoop M v Jaziri M / Seppi A | 6-7,7-6,4-6 |
| ATP - Genève - Doubles Hommes | 2017/05/22 10:00 | Rojer J-J / Tecau H v Koolhof W / Middelkoop M | 7-6,7-6 |
| Challenger - Aix en Provence - Doubles Hommes | 2017/05/13 13:55 | Begemann A / Chardy J v Koolhof W / Middelkoop M | 6-2,4-6,14-16 |