Stadium: Estadio Millennium Round: 29 Ground: Clay
| ATP Estoril MD | 2018/05/05 12:00 | Eysseric J / Salisbury J v Koolhof W / Sitak A | 5-7,3-6 |
| ATP Estoril MD | 2018/05/03 13:45 | Koolhof W / Sitak A v 엘리아스 G / 소우사 P | 7-6,4-6,10-8 |
| ATP Estoril MD | 2018/05/02 11:00 | Lopez M / Marrero D v Koolhof W / Sitak A | 7-6,4-6,3-10 |
| Budapest, Hungary, Doubles | 2018/04/26 09:00 | Koolhof W / Sitak A v Matkowski M / Monroe N | 3-6,4-6 |
| Budapest, Hungary, Doubles | 2018/04/25 09:00 | Mektic N / Peya A v Koolhof W / Sitak A | 5-7,7-6,7-10 |
| ATP Marrakech MD | 2018/04/11 16:50 | Koolhof W / Sitak A v Sharan D / Struff J | 6-7,3-6 |
| Challenger Alicante MD | 2018/04/06 14:45 | Koolhof W / Sitak A v Andreozzi G / Behar A | 6-3,6-2 |
| Challenger Alicante MD | 2018/04/05 09:30 | Koolhof W / Sitak A v Martinez / Vega | 5-7,6-4,10-5 |
| ATP Estoril MD | 2018/05/05 18:15 | 메이얼 L / 소우사 J v 에드문드 킬 / 노리에 카 | 2-6,6-7 |
| ATP Estoril MD | 2018/05/03 17:00 | 에드문드 킬 / 노리에 카 v de Minaur A / Hewitt L | 6-4,7-6 |
| ATP Estoril MD | 2018/04/30 20:10 | Delbonis F / Kicker N v 에드문드 킬 / 노리에 카 | 4-6,0-6 |