 World: Davis Cup - World Group - Doubles - Qualification |
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| | Koolhof W./Rojer J. | Huesler M./Riedi L. | 0:2 (65:7, 62:7) | details | 03.02.2024 |
| | Koolhof W./Rojer J. | Kym J./Ritschard A. | CAN. | details | 03.02.2024 |
| World: Davis Cup - World Group - Doubles - Play Offs |
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| | Bolelli S./Sonego L. | Koolhof W./Rojer J. | CAN. | details | 23.11.2023 |
 France: Paris - Doubles - Main |
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| 1/16-finals | Martin F./Mies A. | Koolhof W./Rojer J. | 2:0 (6:3, 7:5) | details | 01.11.2021 |
 Austria: Vienna - Doubles - Main |
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| 1/8-finals | Cabal J. S./Farah R. | Koolhof W./Rojer J. | 2:1 (4:6, 6:3, 10:8) | details | 26.10.2021 |
 Belgium: Antwerp - Doubles - Main |
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| Final | Koolhof W./Rojer J. | Mahut N./Martin F. | 0:2 (0:6, 1:6) | details | 24.10.2021 |
| Semi-finals | Harris L./Malisse X. | Koolhof W./Rojer J. | 0:2 (4:6, 2:6) | details | 23.10.2021 |
| Quarter-finals | Koolhof W./Rojer J. | Musetti L./Paire B. | WO. | details | 22.10.2021 |
| 1/8-finals | Koolhof W./Rojer J. | Jebavy R./Vasilevski A. | 2:0 (6:4, 6:2) | details | 20.10.2021 |
 USA: Indian Wells - Doubles - Main |
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| 1/8-finals | Koolhof W./Rojer J. | Peers J./Polasek F. | 0:2 (4:6, 65:7) | details | 12.10.2021 |
| 1/16-finals | Koolhof W./Rojer J. | Krajicek A./Mies A. | 2:1 (1:6, 7:64, 10:5) | details | 10.10.2021 |
| USA: US Open - Doubles - Main |
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| 1/8-finals | Peers J./Polasek F. | Koolhof W./Rojer J. | 2:1 (4:6, 6:3, 6:4) | details | 06.09.2021 |
| 1/16-finals | Galloway R./Lawson A. | Koolhof W./Rojer J. | 0:2 (3:6, 63:7) | details | 04.09.2021 |
| 1/32-finals | Karatsev A./Nedovyesov A. | Koolhof W./Rojer J. | 0:2 (613:7, 1:6) | details | 03.09.2021 |
| World: Olympic Games - Doubles - Main |
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| 1/8-finals | Koolhof W./Rojer J. | Daniell M./Venus M. | WO. | details | 26.07.2021 |
| 1/16-finals | Koolhof W./Rojer J. | Gille S./Vliegen J. | 2:0 (6:3, 7:65) | details | 24.07.2021 |
 United Kingdom: Wimbledon - Doubles - Main |
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| 1/32-finals | Koolhof W./Rojer J. | Glasspool L./Heliovaara H. | 1:2 (7:5, 3:6, 4:6) | details | 01.07.2021 |
 Germany: Halle - Doubles - Main |
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| 1/8-finals | Koolhof W./Rojer J. | Auger-Aliassime F./Hurkacz H. | 0:2 (65:7, 3:6) | details | 17.06.2021 |
| France: French Open - Doubles - Main |
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| 1/8-finals | Koolhof W./Rojer J. | Bublik A./Golubev A. | 1:2 (62:7, 6:3, 4:6) | details | 05.06.2021 |
| 1/16-finals | Koolhof W./Rojer J. | Koepfer D./Ruusuvuori E. | 2:0 (6:4, 7:63) | details | 04.06.2021 |
| 1/32-finals | Koolhof W./Rojer J. | Krajinovic F./Lajovic D. | 2:1 (6:4, 4:6, 6:2) | details | 01.06.2021 |
 Italy: Rome - Doubles - Main |
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| Quarter-finals | Arevalo M./Middelkoop M. | Koolhof W./Rojer J. | 2:1 (2:6, 7:63, 10:5) | details | 14.05.2021 |
| 1/8-finals | Behar A./Escobar G. | Koolhof W./Rojer J. | 1:2 (6:4, 3:6, 8:10) | details | 13.05.2021 |
| 1/16-finals | Cecchinato M./Travaglia S. | Koolhof W./Rojer J. | 1:2 (6:4, 1:6, 7:10) | details | 11.05.2021 |
| World: Davis Cup - World Group - Doubles - Qualification |
|---|
| | Golubev A./Nedovyesov A. | Koolhof W./Rojer J. | CAN. | details | 07.03.2020 |
| World: Davis Cup - World Group - Doubles - Main |
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| | Murray J./Skupski N. | Koolhof W./Rojer J. | 2:0 (6:4, 7:66) | details | 20.11.2019 |
