Stadium: Court 5 Round: 26 Ground: Grass
| ATP Halle MD | 2018/06/20 15:30 | Klaasen R / Venus M v Puetz T / Struff J-L | 4-6,6-7 |
| ATP Hertogenbosch MD | 2018/06/16 13:00 | Inglot D / Skugor F v Klaasen R / Venus M | 7-6,7-5 |
| ATP Hertogenbosch MD | 2018/06/15 16:00 | Sharan D / Sitak A v Klaasen R / Venus M | 3-6,2-6 |
| ATP Hertogenbosch MD | 2018/06/15 12:55 | Ebden M / Jaziri M v Klaasen R / Venus M | 6-2,4-6,4-10 |
| ATP Hertogenbosch MD | 2018/06/13 11:15 | Bolt A / Hewitt L v Klaasen R / Venus M | 5-7,5-7 |
| Open de France - Doubles Hommes | 2018/06/02 09:00 | Klaasen R / Venus M v Mektic N / Peya A | 6-7,6-7 |
| Open de France - Doubles Hommes | 2018/05/31 13:10 | Klaasen R / Venus M v Eysseric J / Nys H | 7-6,6-3 |
| Open de France - Doubles Hommes | 2018/05/29 09:00 | Klaasen R / Venus M v Denolly C / Muller A | 6-3,6-3 |