Stadium: Court 11 Round: 25 Ground: Hardcourt outdoor
| ATP Toronto MD | 2018/08/12 17:30 | Klaasen/Venus v Kontinen/Peers | 2-6,7-6,6-10 |
| ATP Toronto MD | 2018/08/11 16:30 | Marach/Pavic v Klaasen/Venus | 6-4,6-7,3-10 |
| ATP Toronto MD | 2018/08/10 18:35 | Bryan/Sock v Klaasen/Venus | 6-7,4-6 |
| ATP Toronto MD | 2018/08/09 15:00 | Klaasen/Venus v Kubot/Melo | 6-3,5-7,11-9 |
| ATP Toronto MD | 2018/08/07 20:30 | Klaasen/Venus v Sitak/Tsitsipas | 6-4,6-4 |
| ATP Washington MD | 2018/08/04 17:35 | Murray/Soares v Klaasen/Venus | 7-5,7-6 |
| ATP Washington MD | 2018/08/03 18:00 | Klaasen/Venus v Cabal/Farah | 6-7,7-6,10-6 |
| ATP Washington MD | 2018/08/01 16:00 | Ram/Rojer v Klaasen/Venus | 6-7,6-7 |