Stadium: Court 5 Round: 26 Ground: Hardcourt outdoor
| Sao Paulo, Brazil, Doubles | 2018/03/04 17:20 | Koolhof W / Sitak A v Delbonis F / Gonzalez M | 4-6,2-6 |
| Sao Paulo, Brazil, Doubles | 2018/03/03 20:00 | Berlocq C / Kicker N v Koolhof W / Sitak A | 3-6,3-6 |
| Sao Paulo, Brazil, Doubles | 2018/02/28 20:45 | Koolhof W / Sitak A v Carballes Baena R / Garcia-Lopez G | 7-5,6-4 |
| Sao Paulo, Brazil, Doubles | 2018/02/27 23:10 | Koolhof W / Sitak A v Arends/Begemann | 6-4,7-6 |
| ATP - Delray Beach - Doubles Femmes | 2018/02/21 16:00 | Koolhof W / Sitak A v Lipsky S / Sharan D | 6-7,2-6 |
| 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 |