Stadium: Arantxa Sanchez Stadium Round: 28 Ground: Clay
| ATP Murray River Open MD | 2021/02/06 01:40 | Mektic/Pavic v Gille/Vliegen | 7-6,3-6,10-6 |
| ATP Madrid MD | 2021/05/07 13:00 | Gille/Vliegen v Dodig/Polasek | 6-3,3-6,10-5 |
| 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 Madrid MD | 2021/05/07 11:00 | Koolhof/Kubot v Mektic/Pavic | 3-6,7-6,7-10 |
| ATP Madrid MD | 2021/05/06 09:00 | Purcell/Saville v Mektic/Pavic | 6-4,3-6,4-10 |
| ATP Monte Carlo MD | 2021/04/18 10:00 | Evans/Skupski v Mektic/Pavic | 3-6,6-4,7-10 |
| ATP Monte Carlo MD | 2021/04/17 09:30 | Granollers/Zeballos v Mektic/Pavic | 6-3,5-7,4-10 |
| ATP Monte Carlo MD | 2021/04/16 10:15 | Herbert/Mahut v Mektic/Pavic | 3-6,1-6 |
| ATP Monte Carlo MD | 2021/04/15 11:20 | Behar/Escobar v Mektic/Pavic | 4-6,6-1,3-10 |
| ATP Miami MD | 2021/04/03 19:30 | Evans/Skupski v Mektic/Pavic | 4-6,4-6 |
| ATP Miami MD | 2021/04/01 17:00 | Ram/Salisbury v Mektic/Pavic | 3-6,6-7 |