 Spain: Madrid - Doubles - Main |
|---|
| 1/16-finals | Griekspoor T./Koolhof W. | Granollers M./Zeballos H. | 0:2 (3:6, 66:7) | details | 30.04.2024 |
| Spain: Barcelona - Doubles - Main |
|---|
| Quarter-finals | Gonzalez M./Molteni A. | Koolhof W./Mektic N. | 2:0 (6:3, 7:61) | details | 18.04.2024 |
| 1/8-finals | Koolhof W./Mektic N. | Ram R./Salisbury J. | 2:0 (7:5, 6:4) | details | 17.04.2024 |
 Monaco: Monte Carlo - Doubles - Main |
|---|
| 1/8-finals | Fritz T./Rune H. | Koolhof W./Mektic N. | 2:1 (4:6, 6:3, 12:10) | details | 09.04.2024 |
| 1/16-finals | Nys H./Zielinski J. | Koolhof W./Mektic N. | 1:2 (5:7, 7:5, 7:10) | details | 08.04.2024 |
 USA: Miami - Doubles - Main |
|---|
| 1/8-finals | Smith J. P./Verbeek S. | Koolhof W./Mektic N. | 2:0 (6:3, 6:3) | details | 25.03.2024 |
| 1/16-finals | Erler A./Miedler L. | Koolhof W./Mektic N. | 0:2 (2:6, 2:6) | details | 24.03.2024 |
| USA: Indian Wells - Doubles - Main |
|---|
| Final | Granollers M./Zeballos H. | Koolhof W./Mektic N. | 0:2 (62:7, 64:7) | details | 15.03.2024 |
| Semi-finals | Krawietz K./Puetz T. | Koolhof W./Mektic N. | 0:2 (2:6, 1:6) | details | 14.03.2024 |
| Quarter-finals | Koolhof W./Mektic N. | Dodig I./Krajicek A. | 2:1 (6:4, 69:7, 10:7) | details | 13.03.2024 |
| 1/8-finals | Seggerman R./Trhac P. | Koolhof W./Mektic N. | 0:2 (4:6, 66:7) | details | 12.03.2024 |
| 1/16-finals | Johnson S./Paul T. | Koolhof W./Mektic N. | 0:2 (2:6, 63:7) | details | 10.03.2024 |
 United Arab Emirates: Dubai - Doubles - Main |
|---|
| 1/8-finals | Koolhof W./Mektic N. | Griekspoor T./Struff J-L. | 0:2 (3:6, 65:7) | details | 27.02.2024 |
 Qatar: Doha - Doubles - Main |
|---|
| Quarter-finals | Murray J./Venus M. | Koolhof W./Mektic N. | 2:0 (6:4, 7:62) | details | 22.02.2024 |
| 1/8-finals | Koolhof W./Mektic N. | Mansouri S./Nawaf R. | 2:1 (3:6, 6:3, 10:8) | details | 21.02.2024 |
 Netherlands: Rotterdam - Doubles - Main |
|---|
| Final | Koolhof W./Mektic N. | Haase R./Van De Zandschulp B. | 2:0 (6:3, 7:5) | details | 18.02.2024 |
| Semi-finals | Dodig I./Krajicek A. | Koolhof W./Mektic N. | 0:2 (5:7, 4:6) | details | 17.02.2024 |
| Quarter-finals | Erler A./Miedler L. | Koolhof W./Mektic N. | 0:2 (3:6, 65:7) | details | 16.02.2024 |
| 1/8-finals | Koolhof W./Mektic N. | Behar A./Pavlasek A. | 2:1 (6:3, 3:6, 10:8) | details | 13.02.2024 |
 World: Davis Cup - World Group - Doubles - Qualification |
|---|
| | 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 |
 Australia: Australian Open - Doubles - Main |
|---|
| 1/8-finals | Koolhof W./Mektic N. | Bopanna R./Ebden M. | 0:2 (68:7, 64:7) | details | 22.01.2024 |
| 1/16-finals | Koolhof W./Mektic N. | Heliovaara H./Peers J. | 2:0 (6:1, 6:4) | details | 19.01.2024 |
| 1/32-finals | Koolhof W./Mektic N. | Doumbia S./Reboul F. | 2:1 (7:64, 2:6, 6:3) | details | 18.01.2024 |
 New Zealand: Auckland - Doubles - Main |
|---|
| Final | Granollers M./Zeballos H. | Koolhof W./Mektic N. | 1:2 (3:6, 7:65, 7:10) | details | 12.01.2024 |
| Semi-finals | Doumbia S./Reboul F. | Koolhof W./Mektic N. | 1:2 (7:5, 65:7, 7:10) | details | 12.01.2024 |
| Quarter-finals | Koolhof W./Mektic N. | Gonzalez M./Molteni A. | 2:1 (6:0, 2:6, 12:10) | details | 11.01.2024 |
| 1/8-finals | Koolhof W./Mektic N. | Erler A./Miedler L. | 2:1 (6:4, 4:6, 10:7) | details | 09.01.2024 |
| Australia: United Cup - Mixed Doubles - Main |
|---|
| | Vekic D./Dodig I. | Schuurs D./Koolhof W. | 1:2 (7:63, 3:6, 12:14) | details | 02.01.2024 |
| | Schuurs D./Koolhof W. | Eikeri U./Ruud C. | 2:0 (7:65, 7:5) | details | 30.12.2023 |
| World: Davis Cup - World Group - Doubles - Play Offs |
|---|
| | Sinner J./Sonego L. | Griekspoor T./Koolhof W. | 2:0 (6:3, 6:4) | details | 23.11.2023 |
| | Bolelli S./Sonego L. | Koolhof W./Rojer J. | CAN. | details | 23.11.2023 |
| World: Finals - Turin - Doubles - Main |
|---|
| Group B | Koolhof W./Skupski N. | Bopanna R./Ebden M. | 0:2 (4:6, 65:7) | details | 17.11.2023 |
| Group B | Koolhof W./Skupski N. | Ram R./Salisbury J. | 1:2 (3:6, 6:3, 7:10) | details | 15.11.2023 |
| Group B | Koolhof W./Skupski N. | Hijikata R./Kubler J. | 2:0 (6:3, 6:4) | details | 13.11.2023 |
 France: Paris - Doubles - Main |
|---|
| Quarter-finals | Gonzalez S./Roger-Vasselin E. | Koolhof W./Skupski N. | 2:0 (6:4, 6:4) | details | 03.11.2023 |
| 1/8-finals | Khachanov K./Rublev A. | Koolhof W./Skupski N. | 0:2 (4:6, 65:7) | details | 02.11.2023 |
 Austria: Vienna - Doubles - Main |
|---|
| 1/8-finals | Koolhof W./Skupski N. | Doumbia S./Reboul F. | 1:2 (6:2, 65:7, 4:10) | details | 25.10.2023 |
 China: Shanghai - Doubles - Main |
|---|
| Quarter-finals | Doumbia S./Reboul F. | Koolhof W./Skupski N. | 2:0 (7:65, 6:4) | details | 12.10.2023 |
| 1/8-finals | Escobar G./Nedovyesov A. | Koolhof W./Skupski N. | 0:2 (62:7, 4:6) | details | 09.10.2023 |
| 1/16-finals | McDonald M./Tiafoe F. | Koolhof W./Skupski N. | 1:2 (7:63, 1:6, 3:10) | details | 08.10.2023 |
| China: Beijing - Doubles - Main |
|---|
| Final | Dodig I./Krajicek A. | Koolhof W./Skupski N. | 2:1 (612:7, 6:3, 10:5) | details | 04.10.2023 |
| Semi-finals | Khachanov K./Rublev A. | Koolhof W./Skupski N. | 0:2 (63:7, 2:6) | details | 03.10.2023 |
| Quarter-finals | Nys H./Zielinski J. | Koolhof W./Skupski N. | 0:2 (2:6, 3:6) | details | 02.10.2023 |
| 1/8-finals | Sun F./Zhou Y. | Koolhof W./Skupski N. | 0:2 (1:6, 4:6) | details | 29.09.2023 |
| World: Davis Cup - World Group - Doubles - Main |
|---|
| | Ajdukovic D./Pavic M. | Koolhof W./Middelkoop M. | 2:1 (3:6, 6:4, 10:8) | details | 17.09.2023 |