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 |
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 |
World: Finals - London - Doubles - Play Offs |
| Final | Melzer J./Roger-Vasselin E. | Koolhof W./Mektic N. | 1:2 (2:6, 6:3, 5:10) | details | 22.11.2020 |
| Semi-finals | Koolhof W./Mektic N. | Granollers M./Zeballos H. | 2:0 (6:3, 6:4) | details | 21.11.2020 |
World: Finals - London - Doubles - Main |
| Group B | Koolhof W./Mektic N. | Kubot L./Melo M. | 1:2 (4:6, 7:62, 8:10) | details | 19.11.2020 |
| Group B | Ram R./Salisbury J. | Koolhof W./Mektic N. | 0:2 (65:7, 0:6) | details | 17.11.2020 |
| Group B | Krawietz K./Mies A. | Koolhof W./Mektic N. | 1:2 (7:63, 64:7, 7:10) | details | 15.11.2020 |
France: Paris - Doubles - Main |
| Quarter-finals | Koolhof W./Mektic N. | Pavic M./Soares B. | 0:2 (1:6, 64:7) | details | 06.11.2020 |
| 1/8-finals | Koolhof W./Mektic N. | Fritz T./Ruud C. | 2:0 (6:4, 7:61) | details | 05.11.2020 |
Austria: Vienna - Doubles - Main |
| 1/8-finals | Farah R./Martin F. | Koolhof W./Mektic N. | 2:0 (7:5, 6:3) | details | 27.10.2020 |
France: French Open - Doubles - Main |
| Semi-finals | Koolhof W./Mektic N. | Krawietz K./Mies A. | 0:2 (3:6, 5:7) | details | 08.10.2020 |
| Quarter-finals | Koolhof W./Mektic N. | Monroe N./Paul T. | 2:0 (6:4, 6:4) | details | 06.10.2020 |
| 1/8-finals | Herbert P./Mahut N. | Koolhof W./Mektic N. | 0:2 (2:6, 63:7) | details | 04.10.2020 |
| 1/16-finals | Mayer L./Pella G. | Koolhof W./Mektic N. | 0:2 (62:7, 3:6) | details | 02.10.2020 |
| 1/32-finals | Bambridge L./McLachlan B. | Koolhof W./Mektic N. | 0:2 (4:6, 64:7) | details | 30.09.2020 |
Germany: Hamburg - Doubles - Main |
| Semi-finals | Dodig I./Pavic M. | Koolhof W./Mektic N. | 2:0 (6:4, 6:4) | details | 25.09.2020 |
| Quarter-finals | Krawietz K./Mies A. | Koolhof W./Mektic N. | 0:2 (3:6, 5:7) | details | 24.09.2020 |
| 1/8-finals | Koolhof W./Mektic N. | Ram R./Salisbury J. | 2:1 (6:4, 60:7, 12:10) | details | 22.09.2020 |
Italy: Rome - Doubles - Main |
| 1/8-finals | Chardy J./Martin F. | Koolhof W./Mektic N. | 2:1 (4:6, 7:62, 10:0) | details | 17.09.2020 |
| 1/16-finals | Rojer J./Tecau H. | Koolhof W./Mektic N. | 0:2 (4:6, 4:6) | details | 16.09.2020 |
USA: US Open - Doubles - Main |
| Final | Pavic M./Soares B. | Koolhof W./Mektic N. | 2:0 (7:5, 6:3) | details | 10.09.2020 |
| Semi-finals | Ram R./Salisbury J. | Koolhof W./Mektic N. | 0:2 (63:7, 4:6) | details | 08.09.2020 |
| Quarter-finals | Koolhof W./Mektic N. | Gille S./Vliegen J. | 2:0 (7:66, 6:3) | details | 06.09.2020 |
| 1/8-finals | Koolhof W./Mektic N. | Bolelli S./Gonzalez M. | 2:0 (6:4, 6:3) | details | 04.09.2020 |
| 1/16-finals | Koolhof W./Mektic N. | Cacic N./Sharan D. | 2:1 (6:4, 3:6, 6:3) | details | 02.09.2020 |
USA: Cincinnati - Doubles - Main |
| Quarter-finals | Koolhof W./Mektic N. | Carreno-Busta P./De Minaur A. | 1:2 (5:7, 7:66, 7:10) | details | 26.08.2020 |
| 1/8-finals | Koolhof W./Mektic N. | Evans D./Goffin D. | 2:0 (7:5, 6:1) | details | 24.08.2020 |