Stadium: Center Court Round: 28 Ground: Clay
| Challenger Braunschweig - MD | 2021/07/07 15:50 | Sabanov/Sabanov v Gengel/Langmajer | 6-1,4-6,10-3 |
| Challenger Bratislava - MD | 2021/06/10 09:00 | Luz/Matos v Sabanov/Sabanov | 6-2,6-3 |
| Challenger Bratislava - MD | 2021/06/09 08:30 | Palovic/Pokorny v Sabanov/Sabanov | 2-6,5-7 |
| ATP Belgrad - MD | 2021/05/27 12:55 | Sabanov/Sabanov v Erlich/Vasilevski | 3-6,6-3,11-13 |
| ATP Belgrad - MD | 2021/05/26 15:50 | Delbonis/Sitak v Sabanov/Sabanov | 2-6,1-6 |
| ATP Belgrad - MD | 2021/05/23 15:20 | Sabanov/Sabanov v Brkic/Cacic | 4-6,6-3,10-8 |
| Challenger Heilbronn - MD | 2021/05/12 13:30 | Matos/M R Alves v Sabanov/Sabanov | 6-3,6-0 |
| Challenger Praga - MD | 2021/05/08 12:50 | Polmans/Stakhovsky v Sabanov/Sabanov | 6-3,6-4 |
| Challenger Braunschweig - MD | 2021/07/08 10:00 | Hidalgo/Gornes v Sijsling/Smits | 6-4,3-6,8-10 |
| Challenger Braunschweig - MD | 2021/07/06 17:10 | Gabashvili/Kadhe v Sijsling/Smits | 4-6,5-7 |
| Challenger Forli - MD | 2021/06/15 14:20 | Lenz/Moraing v Sijsling/Smits | 4-6,7-6,10-1 |
| Challenger St. Petersburg - MD | 2021/03/11 11:00 | Sijsling/Smits v Kravchuk/Yevseyev | 2-6,4-6 |
| Challenger St. Petersburg - MD | 2021/03/10 10:00 | Gabashvili/Nedovyesov v Sijsling/Smits | 1-6,6-3,4-10 |
| Challenger Cherbourg - MD | 2021/02/11 14:45 | Sijsling/Smits v Klein/Molcan | 6-7,6-7 |
| Challenger Cherbourg - MD | 2021/02/09 14:45 | Drzewiecki/Jebavy v Sijsling/Smits | 6-1,6-7,7-10 |
| ITF - Bressuire M15 - MD | 2021/01/19 14:55 | de Schepper/Napolitano v Sijsling/Smits | 7-6,6-7,10-5 |