Stadium: Court 2 Round: 27 Ground: Hardcourt outdoor
| ATP Dubai MD | 2021/03/15 09:00 | Koolhof/Kubot v Melo M / Rojer J J | 6-4,0-6,12-10 |
| ATP Rotterdam MD | 2021/03/03 13:30 | 카르디 J / 마르틴 F v Koolhof/Kubot | 6-4,6-3 |
| ATP Rotterdam MD | 2021/03/02 10:00 | Mclachlan/Nishikori v Koolhof/Kubot | 5-7,6-3,6-10 |
| Australian Open MD | 2021/02/15 06:55 | Ebden/Smith v Koolhof/Kubot | 7-6,6-4 |
| Australian Open MD | 2021/02/14 05:15 | 코크키나키스 T / 키르지오스 N v Koolhof/Kubot | 3-6,4-6 |
| Australian Open MD | 2021/02/11 00:00 | 베할 A / 에스코발 G v Koolhof/Kubot | 3-6,4-6 |
| ATP Murray River Open MD | 2021/02/06 06:45 | 카르디 J / 마르틴 F v Koolhof/Kubot | 7-6,6-3 |
| ATP Murray River Open MD | 2021/02/05 08:30 | 알보트 라 / 게라시모브 에 v Koolhof/Kubot | 2-6,6-3,7-10 |
| ATP Dubai MD | 2021/03/16 14:25 | Kontinen/Thompson v Krawietz/Struff | 7-6,6-7,6-10 |
| ATP Cup, Playoffs | 2021/02/06 04:20 | Krawietz/Struff v Donskoy/Karatsev | 6-3,7-6 |
| ATP Cup, Playoffs | 2021/02/03 05:00 | Krawietz/Struff v Diez/Polansky | 6-7,7-6,3-10 |