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Wesley Koolhof (; born 17 April 1989) is a Dutch former professional tennis player who was ranked World No. 1 in doubles. He is a two-time Grand Slam champion, having won the 2023 Wimbledon Championships in men's doubles with Neal Skupski and the 2022 French Open in mixed doubles with Ena Shibahara.
Koolhof also finished runner-up in men's doubles at the 2020 and 2022 US Opens, alongside Nikola Mektić and Skupski respectively. He has won 21 doubles titles on the ATP Tour, including the 2020 ATP Finals with Mektić and six at Masters 1000 level. Koolhof became world No. 1 for the first time in November 2022, becoming the fourth Dutchman to attain the top ranking in doubles after Tom Okker, Paul Haarhuis and Jacco Eltingh, and ending the year as joint No. 1 alongside Skupski. In singles, he reached his career-high ranking of world No. 462 in August 2013.
Koolhof has represented the Netherlands in the Davis Cup since 2019 and also competed at the 2020 Olympic Games partnering Jean-Julien Rojer and at the 2024 Olympics partnering Tallon Griekspoor. He was part of the team that reached the Davis Cup final in 2024 and the quarterfinals in 2022 and in 2023, the Netherlands' best performances in the competition since 2005.
Koolhof married former WTA tennis player Julia Görges in December 2024 in Arnhem.
Starting the new 2018 year in Brisbane, Sitak and Koolhof lost in the semi-finals to Leonardo Mayer and Horacio Zeballos. They lost in the first round in Auckland to Michael Venus and Raven Klaasen, and then 7–6(5), 4–6, 4–6 in the second round of the Australian Open to the eventual winners, Oliver Marach and Mate Pavić.
Sitak and Koolhof then went to Newport Beach in California where, as top seeds, they lost in the first round in straight sets to Treat Huey and Denis Kudla. They then lost in the quarterfinals at Montpellier before going all the way to the final in the New York Open, being beaten by Max Mirnyi and Philipp Oswald in a match tie-break. They followed that up with a first-round loss at Delray Beach to Scott Lipsky and Divij Sharan.
Their up and down season continued in Brazil, where they reached the final in São Paulo, but were beaten in straight sets by Federico Delbonis and Máximo González. Their next stop was Irving, Texas, where they lost in the semifinals of the ATP Challenger to Alexander Peya and Philipp Petzschner. Moving to Europe, and playing in the Alicante Challenger in Spain as preparation for the European clay court season, they won their second title together when they beat Guido Andreozzi and Ariel Behar in the final in straight sets. They lost in the first round of their next tournament in Marrakech. In the Hungarian Open they beat the top seeds Nikola Mektic and Alexander Peya in the first round, but lost in the second to Marcin Matkowski and Sitak's former partner Nicholas Monroe.
Their next tournament was at Estoril where they went all the way to the final before losing to the British pair of Kyle Edmund and Cameron Norrie. They then lost in the first round of the Bordeaux Challenger tournament after Sitak had been hit in the right ear by a smash from Radu Albot, and also in the first round in Geneva, the last tournament before the French Open.
At Roland Garros, Sitak and Koolhof beat Andre Begemann and Antonio Sancic in the first round, then the ninth seeds Ivan Dodig and Rajeev Ram, before going down to fifth seeds Juan Sebastian Cabal and Robert Farah. All three matches went to a deciding set. After the tournament was finished, it was announced that the pair would split, with Koolhof joining Sitak's fellow New Zealander, and former partner, Marcus Daniell, and Sitak linking up with Indian Divij Sharan.
At the 2019 Wimbledon Championships he reached the quarterfinals partnering Marcus Daniell in doubles and the semifinals in mixed doubles with Květa Peschke.
Seeded seventh, they reached their second Masters 1000 final at the 2022 Mutua Madrid Open after defeating John Isner and Hubert Hurkacz. In the final they defeated fifth seeds Robert Farah and Juan Sebastián Cabal to win their first Masters 1000 title in their career and as a pair. As a result Koolhof returned to the top 10 in the rankings on 9 May 2022.
At the 2022 French Open he won his first Grand Slam title in mixed doubles in his career partnering Ena Shibahara. He also reached the quarterfinals with Skupski for the second time at this Major defeating unseeded pair of Americans Tommy Paul and Mackenzie McDonald.
He reached a new career high doubles ranking of World No. 4 on 8 August at the start of the 2022 National Bank Open where he reached with Skupski the semifinals of a Masters 1000 for the third time in the season defeating Lloyd Glasspool/Harri Heliövaara. Next the pair advanced to the eight final of the season defeating Krawietz/Mies. They won their sixth title defeating Dan Evans (tennis) and John Peers (tennis). As a result he moved to world No. 3 in the doubles rankings on 15 August 2022.
Seeded 2nd at the US Open the pair reached the quarterfinals defeating Wimbledon champions Australian pair of Ebden/Purcell in three sets. Next they defeated Marcelo Demoliner and Joao Sousa to reach the semifinals. They reached the finals after defeating Marcelo Arevalo and Jean-Julien Rojer in the semifinals for a chance to become World No. 1. In the finals, they lost in straight sets to Rajeev Ram and Joe Salisbury. At the 2022 Rolex Paris Masters the pair Koolhof/Skupski reached the semifinals defeating ninth seeds Rohan Bopanna/Matwe Middelkoop climbing to World No. 1 and World No. 2 respectively, and solidifying the No. 1 position as a pair in the doubles race. They reached their 10th final and fourth at a Masters level for the season defeating seventh seeds Lloyd Glasspool /Harri Heliövaara. They won their third Masters title and seventh for the season defeating eight seeds Ivan Dodig/Austin Krajicek in the final. They also clinched the No. 1 year-end ranking as a team.
At the 2023 French Open he reached the quarterfinals with Skupski for the third time in his career. He lost to the 10th seeded team of Horacio Zeballos and Marcel Granollers. He won his first Grand Slam title at the 2023 Wimbledon Championships with Skupski and returned to the No. 1 ranking.
On 28 November 2023, he announced that the 2024 season would be his last on the ATP Tour.
Koolhof and Mektić won their fifth title of the season at the Paris Masters at Accor Arena, defeating Lloyd Glasspool and Adam Pavlásek in the final which went to a deciding champions tiebreak.
He finished his last season ranked in the top 10, at the 2024 ATP Finals, where he partnered with Nikola Mektić, losing his last ATP match in the round robin stage.
Partnering Botic van de Zandschulp Koolhof won the decisive match and helped the Netherlands team reach the semifinals at the 2024 Davis Cup, with a win over Spanish duo Carlos Alcaraz and Marcel Granollers. The Netherlands subsequently reached the final after defeating Germany in the two singles matches.
| Loss | 2020 | US Open | Hard | Nikola Mektić | Mate Pavić Bruno Soares | 5–7, 3–6 |
| Loss | 2022 | US Open | Hard | Neal Skupski | Rajeev Ram Joe Salisbury | 6–7(4–7), 5–7 |
| Win | 2023 | Wimbledon | Grass | Neal Skupski | Marcel Granollers Horacio Zeballos | 6–4, 6–4 |
| 7–6(7–5), 6–2 |
| Win | 2020 | ATP Finals, London | Hard (i) | Nikola Mektić | Jürgen Melzer Édouard Roger-Vasselin | 2–6, 6–3, 10–5 |
| 5–7, 6–7(8–10) | ||||||
| 7–6(7–3), 6–7(3–7), 9–11 | ||||||
| 5–7, 5–7 | ||||||
| 6–7(5–7), 4–6 | ||||||
| 6–7(4–7), 6–4, 10–5 | ||||||
| 6–2, 4–6, 10–6 | ||||||
| 7–6(7–5), 6–4 | ||||||
| 3–6, 6–2, 8–10 | ||||||
| Win | 2024 | Indian Wells Masters | Hard | Nikola Mektić | Marcel Granollers Horacio Zeballos | 7–6(7–2), 7–6(7–4) |
| 6–4, 6–4 | ||||||
| Win | 2024 | Paris Masters (2) | Hard (i) | Nikola Mektić | Lloyd Glasspool Adam Pavlásek | 3–6, 6–3, 10–5 |
| 4th place | 2024 | Summer Olympics, Paris | Clay | Demi Schuurs | Gabriela Dabrowski Félix Auger-Aliassime | 3–6, 6–7(2–7) |
| {class="wikitable" !Legend |
| Grand Slam tournaments (1–2) |
| ATP World Tour Finals (1–0) |
| ATP World Tour Masters 1000 (6–5) |
| ATP World Tour 500 Series (1–6) |
| ATP World Tour 250 Series (12–11) |
| Hard (15–15) |
| Clay (3–7) |
| Grass (3–2) |
| Outdoor (17–16) |
| Indoor (4–8) |
| Win | 1–0 | Sofia Open, Bulgaria | 250 Series | Hard (i) | Matwé Middelkoop | Philipp Oswald Adil Shamasdin | 5–7, 7–6(11–9), 10–6 | |
| Win | 2–0 | Austrian Open, Austria | 250 Series | Clay | Matwé Middelkoop | Dennis Novak Dominic Thiem | 2–6, 6–3, 11–9 | |
| Win | 3–0 | Sydney International, Australia | 250 Series | Hard | Matwé Middelkoop | Jamie Murray Bruno Soares | 6–3, 7–5 | |
| Loss | 3–1 | Rotterdam Open, Netherlands | 500 Series | Hard (i) | Matwé Middelkoop | Ivan Dodig Marcel Granollers | 6–7(5–7), 3–6 | |
| Loss | 3–2 | Atlanta Open, United States | 250 Series | Hard | Artem Sitak | Bob Bryan Mike Bryan | 3–6, 4–6 | |
| Loss | 3–3 | Moselle Open, France | 250 Series | Hard (i) | Artem Sitak | Julien Benneteau Édouard Roger-Vasselin | 5–7, 3–6 | |
| Loss | 3–4 | New York Open, United States | 250 Series | Hard (i) | Artem Sitak | Max Mirnyi Philipp Oswald | 4–6, 6–4, 6–10 | |
| Loss | 3–5 | Brasil Open, Brazil | 250 Series | Clay (i) | Artem Sitak | Federico Delbonis Máximo González | 4–6, 2–6 | |
| Loss | 3–6 | Estoril Open, Portugal | 250 Series | Clay | Artem Sitak | Kyle Edmund Cameron Norrie | 4–6, 2–6 | |
| Loss | 3–7 | Stockholm Open, Sweden | 250 Series | Hard (i) | Marcus Daniell | Luke Bambridge Jonny O'Mara | 5–7, 6–7(8–10) | |
| Win | 4–7 | Brisbane International, Australia | 250 Series | Hard | Marcus Daniell | Rajeev Ram Joe Salisbury | 6–4, 7–6(8–6) | |
| Loss | 4–8 | Miami Open, United States | Masters 1000 | Hard | Stefanos Tsitsipas | Bob Bryan Mike Bryan | 5–7, 6–7(8–10) | |
| Loss | 4–9 | Monte-Carlo Masters, Monaco | Masters 1000 | Clay | Robin Haase | Nikola Mektić Franko Škugor | 7–6(7–3), 6–7(3–7), 9–11 | |
| Loss | 4–10 | Hungarian Open, Hungary | 250 Series | Clay | Marcus Daniell | Ken Skupski Neal Skupski | 3–6, 4–6 | |
| Loss | 4–11 | Rosmalen Championships, Netherlands | 250 Series | Grass | Marcus Daniell | Dominic Inglot Austin Krajicek | 4–6, 6–4, 4–10 | |
| Loss | 4–12 | German Open, Germany | 500 Series | Clay | Robin Haase | Oliver Marach Jürgen Melzer | 2–6, 6–7(3–7) | |
| Loss | 4–13 | Canadian Open, Canada | Masters 1000 | Hard | Robin Haase | Marcel Granollers Horacio Zeballos | 5–7, 5–7 | |
| Win | 5–13 | Qatar Open, Qatar | 250 Series | Hard | Rohan Bopanna | Luke Bambridge Santiago González | 3–6, 6–2, 10–6 | |
| Loss | 5–14 | Open 13, France | 250 Series | Hard (i) | Nikola Mektić | Nicolas Mahut Vasek Pospisil | 3–6, 4–6 | |
| Loss | 5–15 | US Open, United States | Grand Slam | Hard | Nikola Mektić | Mate Pavić Bruno Soares | 5–7, 3–6 | |
| Win | 6–15 | ATP Finals, United Kingdom | Tour Finals | Hard (i) | Nikola Mektić | Jürgen Melzer Édouard Roger-Vasselin | 2–6, 6–3, 10–5 | |
| Win | 7–15 | Bavarian Championships, Germany | 250 Series | Clay | Kevin Krawietz | Sander Gillé Joran Vliegen | 4–6, 6–4, 10–5 | |
| Loss | 7–16 | European Open, Belgium | 250 Series | Hard (i) | Jean-Julien Rojer | Nicolas Mahut Fabrice Martin | 0–6, 1–6 | |
| Win | 8–16 | Melbourne Summer Set 1, Australia | 250 Series | Hard | Neal Skupski | Aleksandr Nedovyesov Aisam-ul-Haq Qureshi | 6–4, 6–4 | |
| Win | 9–16 | Adelaide International 2, Australia | 250 Series | Hard | Neal Skupski | Ariel Behar Gonzalo Escobar | 7–6(7–5), 6–4 | |
| Win | 10–16 | Qatar Open, Qatar (2) | 250 Series | Hard | Neal Skupski | Rohan Bopanna Denis Shapovalov | 7–6(7–4), 6–1 | |
| Loss | 10–17 | Miami Open, United States | Masters 1000 | Hard | Neal Skupski | Hubert Hurkacz John Isner | 6–7(5–7), 4–6 | |
| Loss | 10–18 | Barcelona Open, Spain | 500 Series | Clay | Neal Skupski | Kevin Krawietz Andreas Mies | 7–6(7–3), 6–7(5–7), 6–10 | |
| Win | 11–18 | Madrid Open, Spain | Masters 1000 | Clay | Neal Skupski | Juan Sebastián Cabal Robert Farah | 6–7(4–7), 6–4, 10–5 | |
| Win | 12–18 | Rosmalen Championships, Netherlands | 250 Series | Grass | Neal Skupski | Matthew Ebden Max Purcell | 4–6, 7–5, 10–6 | |
| Win | 13–18 | Canadian Open, Canada | Masters 1000 | Hard | Neal Skupski | Dan Evans John Peers | 6–2, 4–6, 10–6 | |
| Loss | 13–19 | US Open, United States | Grand Slam | Hard | Neal Skupski | Rajeev Ram Joe Salisbury | 6–7(4–7), 5–7 | |
| Win | 14–19 | Paris Masters, France | Masters 1000 | Hard (i) | Neal Skupski | Ivan Dodig Austin Krajicek | 7–6(7–5), 6–4 | |
| Loss | 14–20 | Indian Wells Masters, United States | Masters 1000 | Hard | Neal Skupski | Rohan Bopanna Matthew Ebden | 3–6, 6–2, 8–10 | |
| Loss | 14–21 | Barcelona Open, Spain | 500 Series | Clay | Neal Skupski | Máximo González Andrés Molteni | 3–6, 7–6(10–8), 4–10 | |
| Win | 15–21 | Rosmalen Championships, Netherlands (2) | 250 Series | Grass | Neal Skupski | Gonzalo Escobar Aleksandr Nedovyesov | 7–6(7–1), 6–2 | |
| Win | 16–21 | Wimbledon Championships, United Kingdom | Grand Slam | Grass | Neal Skupski | Marcel Granollers Horacio Zeballos | 6–4, 6–4 | |
| Loss | 16–22 | China Open, China | 500 Series | Hard | Neal Skupski | Ivan Dodig Austin Krajicek | 7–6(14–12), 3–6, 5–10 | |
| Win | 17–22 | Jan 2024 | Auckland Open, New Zealand | 250 Series | Hard | Nikola Mektić | Marcel Granollers Horacio Zeballos | 6–3, 6–7(5–7), 10–7 |
| Win | 18–22 | Rotterdam Open, Netherlands | 500 Series | Hard (i) | Nikola Mektić | Robin Haase Botic van de Zandschulp | 6–3, 7–5 | |
| Win | 19–22 | Indian Wells Masters, United States | Masters 1000 | Hard | Nikola Mektić | Marcel Granollers Horacio Zeballos | 7–6(7–2), 7–6(7–4) | |
| Loss | 19–23 | Rosmalen Championships, Netherlands | 250 Series | Grass | Nikola Mektić | Nathaniel Lammons Jackson Withrow | 6–7(5–7), 6–7(3–7) | |
| Win | 20–23 | Shanghai Masters, China | Masters 1000 | Hard | Nikola Mektić | Máximo González Andrés Molteni | 6–4, 6–4 | |
| Loss | 20–24 | Swiss Indoors, Switzerland | 500 Series | Hard (i) | Nikola Mektić | Jamie Murray John Peers | 3–6, 5–7 | |
| Win | 21–24 | Paris Masters, France (2) | Masters 1000 | Hard (i) | Nikola Mektić | Lloyd Glasspool Adam Pavlásek | 3–6, 6–3, 10–5 |
| 17 November 2013 | Guayaquil, Ecuador | Clay | Stephan Fransen | Roman Borvanov Alexander Satschko | 1–6, 6–2, 10–5 |
| 27 July 2014 | Oberstaufen Cup, Germany | Clay | Alessandro Motti | Radu Albot Mateusz Kowalczyk | 7–6(9–7), 6–3 |
| 6 February 2015 | Glasgow, United Kingdom | Hard (i) | Matwé Middelkoop | Sergei Bubka Aleksandr Nedovyesov | 6–1, 6–4 |
| 2 May 2015 | Turin, Italy | Clay | Matwé Middelkoop | Dino Marcan Antonio Šančić | 4–6, 6–3, 10–5 |
| 4. July 2015 | Marburg Open, Germany | Clay | Matwé Middelkoop | Tobias Kamke Simon Stadler | 6–1, 7–5 |
| 15 August 2015 | Prague, Czech Republic | Clay | Matwé Middelkoop | Sergey Betov Mikhail Elgin | 6–4, 3–6, 10–7 |
| 11 September 2015 | Copa Sevilla, Spain | Clay | Matwé Middelkoop | Marco Bortolotti Kamil Majchrzak | 7–6(7–5), 6–4 |
| 26 September 2015 | Trnava, Slovakia | Clay | Matwé Middelkoop | Kamil Majchrzak Stéphane Robert | 6–4, 6–2 |
| 25 October 2015 | Brest Challenger, France | Hard (i) | Matwé Middelkoop | Ken Skupski Neal Skupski | 3–6, 6–4, 10–6 |
| 16 January 2016 | Bangkok, Thailand | Hard | Matwé Middelkoop | Gero Kretschmer Alexander Satschko | 6–3, 7–6(7–1) |
| 19 June 2016 | Ilkley, United Kingdom | Grass | Matwé Middelkoop | Marcelo Demoliner Aisam-ul-Haq Qureshi | 7–6(7–5), 0–6, 10–8 |
| 31 July 2016 | Scheveningen, Netherlands | Clay | Matwé Middelkoop | Tallon Griekspoor Tim van Rijthoven | 6–1, 3–6, 13–11 |
| 26 November 2016 | Andria, Italy | Carpet (i) | Matwé Middelkoop | Roman Jebavý Zdeněk Kolář | 6–3, 6–3 |
| 13 May 2017 | Aix-en-Provence, France | Clay | Matwé Middelkoop | Andre Begemann Jérémy Chardy | 2–6, 6–4, 16–14 |
| Grand Slam tournaments | ||||||||||||||
| Australian Open | A | A | A | A | 2R | 2R | 2R | 2R | 3R | QF | QF | 3R | 0 / 8 | 14–8 |
| French Open | A | A | A | 1R | 1R | 3R | 2R | SF | 3R | QF | QF | 2R | 0 / 9 | 16–9 |
| Wimbledon | A | A | Q1 | 2R | 1R | 1R | QF | NH | 1R | 3R | W | 2R | 1 / 8 | 13–7 |
| US Open | A | A | A | 1R | 1R | 2R | 3R | F | 3R | F | 3R | QF | 0 / 9 | 19–9 |
| Overall win–loss | 0–0 | 0–0 | 0–0 | 1–3 | 1–4 | 4–4 | 7–4 | 9–3 | 6–4 | 13–4 | 14–3 | 7–4 | 1 / 34 | 62–33 |
| Year-end championship | ||||||||||||||
| ATP Finals | Did not qualify | W | DNQ | SF | RR | RR | 1 / 4 | 8–7 | ||||||
| ATP World Tour Masters 1000 | ||||||||||||||
| Indian Wells Masters | A | A | A | A | A | A | 1R | NH | 2R | QF | F | W | 1 / 5 | 11–4 |
| Miami Open | A | A | A | A | A | A | F | 1R | F | QF | 2R | 0 / 5 | 11–5 | |
| Monte-Carlo Masters | A | A | A | A | A | A | F | 2R | 1R | QF | 2R | 0 / 5 | 6–5 | |
| Madrid Open | A | A | A | A | A | A | SF | QF | W | QF | 1R | 1 / 5 | 12–4 | |
| Italian Open | A | A | A | A | A | A | 1R | 2R | QF | QF | SF | QF | 0 / 6 | 10–6 |
| Canadian Open | A | A | A | A | A | A | F | NH | 2R | W | 2R | A | 1 / 4 | 9–3 |
| Cincinnati Masters | A | A | A | A | A | A | 1R | QF | 2R | 2R | 2R | 2R | 0 / 6 | 4–6 |
| Shanghai Masters | A | A | A | A | A | A | 1R | NH | QF | W | 1 / 3 | 8–2 | ||
| Paris Masters | A | A | A | A | A | 1R | 1R | QF | 1R | W | QF | W | 2 / 7 | 10–5 |
| Win–loss | 0–0 | 0–0 | 0–0 | 0–0 | 0–0 | 0–1 | 15–9 | 4–3 | 8–8 | 21–5 | 14–9 | 18–5 | 6 / 46 | 80–40 |
| Win–loss | ||||||||||||||
| Tournaments | 1 | 1 | 3 | 17 | 22 | 27 | 26 | 14 | 21 | 21 | 25 | 24 | 202 | |
| Titles | 0 | 0 | 0 | 2 | 1 | 0 | 1 | 2 | 1 | 7 | 2 | 5 | 21 | |
| Finals | 0 | 0 | 0 | 2 | 4 | 4 | 7 | 4 | 2 | 10 | 5 | 7 | 45 | |
| Overall win–loss | 0–1 | 0–1 | 2–3 | 13–15 | 18–21 | 29–27 | 42–27 | 28–13 | 24–19 | 58-21 | 47–25 | 47-22 | 308–195 | |
| Year-end ranking | 161 | 221 | 67 | 60 | 46 | 42 | 14 | 5 | 21 | 1 | 8 | 8 ! colspan="2" | ||
| Australian Open | A | A | 1R | 1R | 1R | 2R | 1R | 0 / 5 |
| French Open | A | A | 1R | NH | SF | W | A | 1 / 3 |
| Wimbledon | 1R | A | SF | NH | 2R | A | 2R | 0 / 4 |
| US Open | A | QF | QF | NH | A | A | A | 0 / 2 |
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