Stadium: Stadium 3 Round: 26 Ground: Clay
| ATP Madrid MD | 2021/05/05 12:30 | Ram/Salisbury v Bublik/Garin | 6-7,5-7 |
| ATP Madrid MD | 2021/05/04 15:40 | Gille/Vliegen v Fucsovics/Ruud | 6-3,6-4 |
| ATP Munich MD | 2021/05/02 10:30 | Koolhof/Krawietz v Gille/Vliegen | 4-6,6-4,10-5 |
| ATP Munich MD | 2021/04/30 10:00 | Gille/Vliegen v Brown/Gojowczyk | 6-3,6-7,13-11 |
| ATP Munich MD | 2021/04/27 09:00 | Erlich/Sharan v Gille/Vliegen | 3-6,2-6 |
| ATP Barcelona MD | 2021/04/17 15:50 | Gille/Vliegen v Mannarino/Paire | 4-6,4-6 |
| ATP Monte Carlo MD | 2021/04/13 14:35 | Gille/Vliegen v Evans/Skupski | 6-7,6-3,8-10 |
| ATP Marbella MD | 2021/04/05 14:50 | Gille/Vliegen v Marrero/Menendez-Maceiras | 6-4,6-7,8-10 |
| ATP Miami MD | 2021/03/25 20:30 | Auger Aliassime/Hurkacz v Gille/Vliegen | 6-4,6-3 |