Stadium: Stadium Round: 26 Ground: Hardcourt outdoor
| ATP New York MD | 2018/02/18 18:00 | Koolhof W / Sitak A v Mirnyi M / Oswald P | 4-6,6-4,6-10 |
| ATP New York MD | 2018/02/18 03:05 | Koolhof W / Sitak A v Albot R / Basilashvili N | 6-4,6-3 |
| ATP New York MD | 2018/02/16 22:30 | Chardy J / Martin F v Koolhof W / Sitak A | 4-6,6-3,6-10 |
| ATP New York MD | 2018/02/14 18:00 | Koolhof W / Sitak A v Nestor D / Skupski N | 6-3,6-1 |
| ATP - Montpellier - Doubles Hommes | 2018/02/08 13:45 | Koolhof W / Sitak A v Arends S / Sancic A | 6-3,4-6,5-10 |
| ATP - Montpellier - Doubles Hommes | 2018/02/07 19:25 | Dodig I / Ram R v Koolhof W / Sitak A | 6-2,5-7,0-10 |
| Newport Beach, USA, Doubles | 2018/01/24 23:50 | Koolhof W / Sitak A v Huey T / Kudla D | 2-6,1-6 |
| Open d'Australie - Doubles Hommes | 2018/01/19 01:30 | Koolhof W / Sitak A v Marach O / Pavic M | 7-6,4-6,4-6 |
| ATP New York MD | 2018/02/13 22:45 | Harrison R / Johnson S v Lipsky S / Sharan D | 7-5,6-3 |
| ATP Sofia MD | 2018/02/10 13:30 | Lipsky S / Sharan D v Haase R / Middelkoop M | 4-6,2-6 |
| ATP Sofia MD | 2018/02/08 16:25 | Arneodo/Weissborn v Lipsky S / Sharan D | 4-6,7-6,5-10 |
| ATP Sofia MD | 2018/02/06 13:00 | Kuzmanov D / Mladenov V v Lipsky S / Sharan D | 4-6,4-6 |
| ATP Antwerp MD | 2017/10/22 12:00 | Gonzalez S / Peralta J v Lipsky S / Sharan D | 4-6,6-2,5-10 |
| ATP Antwerp MD | 2017/10/20 10:00 | Lipsky S / Sharan D v Dodig I / Granollers M | 0-6,6-4,10-5 |
| ATP Antwerp MD | 2017/10/19 12:00 | Lipsky S / Sharan D v Klaasen R / Ram R | 6-4,4-6,10-8 |
| ATP Antwerp MD | 2017/10/17 14:40 | Darcis S / de Greef A v Lipsky S / Sharan D | 5-7,6-4,8-10 |