Round: 27 Ground: Hardcourt indoor
| ATP Antwerp - MP | 2021/10/20 12:20 | Koolhof/Rojer v Jebavy/Vasilevski | 6-4,6-2 |
| ATP Indian Wells - MP | 2021/10/12 21:35 | Koolhof/Rojer v Peers/Polasek | 4-6,6-7 |
| ATP Indian Wells - MP | 2021/10/10 18:00 | Koolhof/Rojer v Krajicek/Mies | 1-6,7-6,10-5 |
| USA lahtised meistrivõistlused - MP | 2021/09/06 20:20 | Peers/Polasek v Koolhof/Rojer | 4-6,6-3,6-4 |
| USA lahtised meistrivõistlused - MP | 2021/09/04 15:00 | Galloway/Lawson v Koolhof/Rojer | 3-6,6-7 |
| USA lahtised meistrivõistlused - MP | 2021/09/03 17:00 | Karatsev/Nedovyesov v Koolhof/Rojer | 6-7,1-6 |
| Olümpiamängud 2020 - MP | 2021/07/24 02:00 | Koolhof/Rojer v Gille/Vliegen | 6-3,7-6 |
| Wimbledon - MP | 2021/07/01 17:00 | Koolhof/Rojer v Glasspool/Heliovaara | 7-5,3-6,4-6 |
| ATP Antwerp - MP | 2021/10/18 15:50 | Musetti/Paire v Monroe/Opelka | 6-7,7-6,10-8 |