Stadium: Court 11 Round: 25 Ground: Hardcourt outdoor
| ATP Toronto MD | 2021/08/13 16:00 | Krawietz/Tecau v Karatsev/Lajovic | 6-3,3-6,10-3 |
| ATP Toronto MD | 2021/08/12 18:00 | Karatsev/Lajovic v Kubot/Melo | 6-4,6-4 |
| ATP Toronto MD | 2021/08/09 16:55 | De Minaur/Norrie v Karatsev/Lajovic | 4-6,7-6,8-10 |