Stadium: Court 1 Round: 27 Ground: Clay
| ATP - Parma - Herredouble | 2021/05/26 09:00 | Gille/Vliegen v Passaro/Travaglia | 7-6,6-4 |
| ATP - Rom - Herredouble | 2021/05/12 17:25 | Gille/Vliegen v Ram/Salisbury | 3-6,6-2,10-12 |
| ATP - Madrid - Herredouble | 2021/05/08 12:00 | Gille/Vliegen v Mektic/Pavic | 4-6,2-6 |
| ATP - Madrid - Herredouble | 2021/05/07 13:00 | Gille/Vliegen v Dodig/Polasek | 6-3,3-6,10-5 |
| ATP - Madrid - Herredouble | 2021/05/04 15:40 | Gille/Vliegen v Fucsovics/Ruud | 6-3,6-4 |
| ATP - München - Herredouble | 2021/05/02 10:30 | Koolhof/Krawietz v Gille/Vliegen | 4-6,6-4,10-5 |
| ATP - München - Herredouble | 2021/04/30 10:00 | Gille/Vliegen v Brown/Gojowczyk | 6-3,6-7,13-11 |
| ATP - München - Herredouble | 2021/04/27 09:00 | Erlich/Sharan v Gille/Vliegen | 3-6,2-6 |
| ATP - Parma - Herredouble | 2021/05/26 10:40 | Marrero/Vega Hernandez v Jebavy/Nedovyesov | 7-6,2-6,6-10 |