Stadium: Arena Annexe Round: 26 Ground: Hardcourt indoor
| ATP Antwerp MD | 2017/10/21 09:00 | Gonzalez S / Peralta J v Koolhof W / Sitak A | 7-5,6-3 |
| ATP Antwerp MD | 2017/10/18 16:35 | 마르틴 F / 로젤-바셀린 E v Koolhof W / Sitak A | 4-6,6-7 |
| ATP Antwerp MD | 2017/10/17 17:40 | 스쿱스키 K / 스쿱스키 N v Koolhof W / Sitak A | 4-6,6-4,8-10 |
| Beijing, China, Doubles | 2017/10/02 11:00 | Koolhof W / Sitak A v 델 포트로 유 / 마이엘 레 | 4-6,6-3,7-10 |
| ATP Beijing Qual MD | 2017/09/30 09:02 | Koolhof W / Sitak A v Jebavy/Marrero | 7-6,5-1 |
| ATP Shenzhen MD | 2017/09/27 06:00 | Begemann A / Skugor F v Koolhof W / Sitak A | 7-5,7-6 |
| ATP Metz MD | 2017/09/24 11:45 | Benneteau J / Roger-Vasselin E v Koolhof W / Sitak A | 7-5,6-3 |
| ATP Metz MD | 2017/09/22 14:00 | Koolhof W / Sitak A v Mirnyi M / Oswald P | 6-4,3-6,10-7 |