![Wesley Koolhof and Nikola Mektic in action during their doubles match on day one of the Nitto ATP Finals at The O2 Arena, London Stock Photo - Alamy Wesley Koolhof and Nikola Mektic in action during their doubles match on day one of the Nitto ATP Finals at The O2 Arena, London Stock Photo - Alamy](https://c8.alamy.com/comp/2DATTTG/wesley-koolhof-and-nikola-mektic-in-action-during-their-doubles-match-on-day-one-of-the-nitto-atp-finals-at-the-o2-arena-london-2DATTTG.jpg)
Wesley Koolhof and Nikola Mektic in action during their doubles match on day one of the Nitto ATP Finals at The O2 Arena, London Stock Photo - Alamy
![ATP Tour on Twitter: "The doubles semi-finals are locked in! 🔒 🇳🇱🇭🇷 Koolhof/Mektic v Granollers/Zeballos 🇪🇸🇦🇷 🇦🇹🇫🇷 Melzer/Roger-Vasselin v Ram/Salisbury 🇺🇸🇬🇧 Who will walk away with the title? 🏆 #NittoATPFinals https://t.co/v6IFpw1Nq4" / ATP Tour on Twitter: "The doubles semi-finals are locked in! 🔒 🇳🇱🇭🇷 Koolhof/Mektic v Granollers/Zeballos 🇪🇸🇦🇷 🇦🇹🇫🇷 Melzer/Roger-Vasselin v Ram/Salisbury 🇺🇸🇬🇧 Who will walk away with the title? 🏆 #NittoATPFinals https://t.co/v6IFpw1Nq4" /](https://pbs.twimg.com/media/EnSmnqqUcAA66FH.jpg:large)
ATP Tour on Twitter: "The doubles semi-finals are locked in! 🔒 🇳🇱🇭🇷 Koolhof/Mektic v Granollers/Zeballos 🇪🇸🇦🇷 🇦🇹🇫🇷 Melzer/Roger-Vasselin v Ram/Salisbury 🇺🇸🇬🇧 Who will walk away with the title? 🏆 #NittoATPFinals https://t.co/v6IFpw1Nq4" /
![ATP Finals 2020: Koolhof and Mektic win double titles - final victory over Melzer / Roger-Vasselin · tennisnet.com ATP Finals 2020: Koolhof and Mektic win double titles - final victory over Melzer / Roger-Vasselin · tennisnet.com](https://www.tennisnet.com/fileadmin/_processed_/f/e/csm_koolhof-mektic-london_285ebc8323.jpg)
ATP Finals 2020: Koolhof and Mektic win double titles - final victory over Melzer / Roger-Vasselin · tennisnet.com
![Mate Pavic, of Croatia, left, and Bruno Soares, of Brazil, celebrate a point against Wesley Koolhof, of the Netherlands, and Nikola Mektic, of Croatia, during the men's doubles final of the U.S. Mate Pavic, of Croatia, left, and Bruno Soares, of Brazil, celebrate a point against Wesley Koolhof, of the Netherlands, and Nikola Mektic, of Croatia, during the men's doubles final of the U.S.](https://c8.alamy.com/comp/2MG4HWP/mate-pavic-of-croatia-left-and-bruno-soares-of-brazil-celebrate-a-point-against-wesley-koolhof-of-the-netherlands-and-nikola-mektic-of-croatia-during-the-mens-doubles-final-of-the-us-open-tennis-championships-thursday-sept-10-2020-in-new-york-ap-photoseth-wenig-2MG4HWP.jpg)
Mate Pavic, of Croatia, left, and Bruno Soares, of Brazil, celebrate a point against Wesley Koolhof, of the Netherlands, and Nikola Mektic, of Croatia, during the men's doubles final of the U.S.
![Nikola Mektic, of Croatia, top left, and Wesley Koolhof, of the Netherlands, right, return a shot to Bruno Soares, of Brazil, lower right, and Mate Pavic, of Croatia during the men's doubles Nikola Mektic, of Croatia, top left, and Wesley Koolhof, of the Netherlands, right, return a shot to Bruno Soares, of Brazil, lower right, and Mate Pavic, of Croatia during the men's doubles](https://c8.alamy.com/comp/2MG4HXE/nikola-mektic-of-croatia-top-left-and-wesley-koolhof-of-the-netherlands-right-return-a-shot-to-bruno-soares-of-brazil-lower-right-and-mate-pavic-of-croatia-during-the-mens-doubles-final-of-the-us-open-tennis-championships-thursday-sept-10-2020-in-new-york-ap-photoseth-wenig-2MG4HXE.jpg)
Nikola Mektic, of Croatia, top left, and Wesley Koolhof, of the Netherlands, right, return a shot to Bruno Soares, of Brazil, lower right, and Mate Pavic, of Croatia during the men's doubles
![Wesley Koolhof Netherlands R Nikola Mektic Editorial Stock Photo - Stock Image | Shutterstock Editorial Wesley Koolhof Netherlands R Nikola Mektic Editorial Stock Photo - Stock Image | Shutterstock Editorial](https://editorial01.shutterstock.com/wm-preview-1500/10772644ab/7820110a/Shutterstock_10772644ab.jpg)
Wesley Koolhof Netherlands R Nikola Mektic Editorial Stock Photo - Stock Image | Shutterstock Editorial
![R. Hasse and W. Koolhof, with doubles champions N. Mektic and F. Skugor @CelinaLafuentedeLavotha | Monaco Reporter R. Hasse and W. Koolhof, with doubles champions N. Mektic and F. Skugor @CelinaLafuentedeLavotha | Monaco Reporter](https://monacoreporter.files.wordpress.com/2019/04/r.-hasse-and-w.-koolhof-with-doubles-champions-n.-mektic-and-f.-skugor-40celinalafuentedelavotha-e1555874517219.jpg)
R. Hasse and W. Koolhof, with doubles champions N. Mektic and F. Skugor @CelinaLafuentedeLavotha | Monaco Reporter
![Wesley Koolhof and Nikola Mektic secure the first qualifying spot in the semifinal at the ATP Final - UBITENNIS Wesley Koolhof and Nikola Mektic secure the first qualifying spot in the semifinal at the ATP Final - UBITENNIS](https://www.ubitennis.net/wp-content/uploads/2020/11/koolhof-and-mektic-london-second-match.jpg)
Wesley Koolhof and Nikola Mektic secure the first qualifying spot in the semifinal at the ATP Final - UBITENNIS
![Wesley Koolhof and Nikola Mektic start the ATP Finals with a three-set win over Kevin Krawietz and Andreas Mies - UBITENNIS Wesley Koolhof and Nikola Mektic start the ATP Finals with a three-set win over Kevin Krawietz and Andreas Mies - UBITENNIS](https://www.ubitennis.net/wp-content/uploads/2020/11/koolhof-and-mektic-atp-finals-.jpg)
Wesley Koolhof and Nikola Mektic start the ATP Finals with a three-set win over Kevin Krawietz and Andreas Mies - UBITENNIS
![Wesley Koolhof and Nikola Mektic win their first doubles title as a team at the ATP Finals - UBITENNIS Wesley Koolhof and Nikola Mektic win their first doubles title as a team at the ATP Finals - UBITENNIS](https://www.ubitennis.net/wp-content/uploads/2020/11/koolhof-mektic.jpg)
Wesley Koolhof and Nikola Mektic win their first doubles title as a team at the ATP Finals - UBITENNIS
![Nikola Mektic and Mate Pavic's historic season comes to the 2021 US Open - Official Site of the 2023 US Open Tennis Championships - A USTA Event Nikola Mektic and Mate Pavic's historic season comes to the 2021 US Open - Official Site of the 2023 US Open Tennis Championships - A USTA Event](https://photo-assets.usopen.org/images/pics/large/b_MekticPavic.jpg)