Stadium: Court 1 Round: 27 Ground: Hardcourt outdoor
| ATP - Dubaï - Doubles Hommes | 2020/02/25 14:35 | AL Janahi A / AL Janahi F v Koolhof/Nikola Mektic | 0-6,1-6 |
| ATP - Marseille - Doubles Hommes | 2020/02/23 10:45 | Mahut N / Pospisil V v Koolhof/Nikola Mektic | 6-3,6-4 |
| ATP - Marseille - Doubles Hommes | 2020/02/21 12:00 | Nielsen F / Puetz T v Koolhof/Nikola Mektic | 4-6,2-6 |
| ATP - Marseille - Doubles Hommes | 2020/02/19 12:35 | Erlich J / Vasilevski A v Koolhof/Nikola Mektic | 3-6,5-7 |
| ATP - Marseille - Doubles Hommes | 2020/02/17 15:50 | Brkic T / Cilic M v Koolhof/Nikola Mektic | 5-7,6-1,10-12 |
| ATP - Rotterdam - Doubles Hommes | 2020/02/10 10:00 | Auger-Aliassime F / Hurkacz H v Koolhof/Nikola Mektic | 6-3,7-6 |
| Open d'Australie - Doubles Hommes | 2020/01/25 00:00 | Duckworth/Polmans v Koolhof/Nikola Mektic | 7-5,6-3 |
| Open d'Australie - Doubles Hommes | 2020/01/22 05:00 | Cecchinato M / Djere L v Koolhof/Nikola Mektic | 3-6,6-7 |
| ATP - Dubaï - Doubles Hommes | 2020/02/25 11:35 | Khachanov/Rublev v Klaasen R / Marach O | 6-7,3-6 |
| ATP - Rotterdam - Doubles Hommes | 2020/02/15 12:00 | Klaasen R / Marach O v Herbert P-H / Mahut N | 7-6,6-7,7-10 |
| ATP - Rotterdam - Doubles Hommes | 2020/02/13 14:00 | Klaasen R / Marach O v Auger-Aliassime F / Hurkacz H | 6-4,6-7,10-8 |
| ATP - Rotterdam - Doubles Hommes | 2020/02/12 15:45 | Klaasen R / Marach O v Arends S / Pel D | 6-3,7-5 |
| Open d'Australie - Doubles Hommes | 2020/01/24 02:50 | Molteni A / Nys H v Klaasen R / Marach O | 6-7,6-3,6-4 |
| Open d'Australie - Doubles Hommes | 2020/01/22 06:50 | Kecmanovic M / Ruud C v Klaasen R / Marach O | 2-6,6-4,3-6 |
| ATP - Adelaïde - Doubles Hommes | 2020/01/13 02:10 | Klaasen R / Marach O v Kubot L / Melo M | 2-6,4-6 |