Stadium: Court 11 Round: 25 Ground: Hardcourt outdoor
| Wimbledon MD | 2021/07/01 17:00 | Koolhof/Rojer v Glasspool/Heliovaara | 7-5,3-6,4-6 |
| ATP Halle MD | 2021/06/17 10:35 | Koolhof/Rojer v Auger Aliassime/Hurkacz | 6-7,3-6 |
| French Open MD | 2021/06/05 12:25 | Koolhof/Rojer v Bublik/Golubev | 6-7,6-3,4-6 |
| French Open MD | 2021/06/04 11:25 | Koolhof/Rojer v Koepfer/Ruusuvuori | 6-4,7-6 |
| French Open MD | 2021/06/01 12:45 | Koolhof/Rojer v Krajinovic/Lajovic | 6-4,4-6,6-2 |
| ATP Rome MD | 2021/05/14 08:00 | Arevalo/Middelkoop v Koolhof/Rojer | 2-6,7-6,10-5 |
| ATP Rome MD | 2021/05/13 08:00 | Behar/Escobar v Koolhof/Rojer | 6-4,3-6,8-10 |
| ATP Rome MD | 2021/05/11 11:40 | Cecchinato/Travaglia v Koolhof/Rojer | 6-4,1-6,7-10 |
| Wimbledon MD | 2021/07/01 10:00 | Gille/Vliegen v Marach/Qureshi | 4-6,4-6 |
| ATP Halle MD | 2021/06/18 12:00 | Krawietz/Tecau v Gille/Vliegen | 7-6,7-5 |
| ATP Halle MD | 2021/06/17 13:45 | Gille/Vliegen v Bopanna/Sharan | 6-3,7-6 |
| ATP Halle MD | 2021/06/16 14:45 | Gille/Vliegen v Saville/Thompson | 7-6,6-3 |
| French Open MD | 2021/06/06 09:00 | Andujar/Martinez v Gille/Vliegen | 6-4,7-6 |
| French Open MD | 2021/06/04 09:00 | Krajicek/Sandgren v Gille/Vliegen | 4-6,1-6 |
| French Open MD | 2021/06/02 10:25 | Sonego/Vavassori v Gille/Vliegen | 4-6,4-6 |
| ATP Parma MD | 2021/05/26 09:00 | Gille/Vliegen v Passaro/Travaglia | 7-6,6-4 |