Marcus Daniell is a New Zealand former professional tennis player. He reached his career-high ATP doubles ranking of world No. 34 on 29 January 2018 after reaching the quarterfinals of the Australian Open. He won a bronze medal in the men's doubles at the 2020 Summer Olympics, alongside Michael Venus.
Robin Haase and Matwé Middelkoop were the defending champions, but chose to compete in Doha instead.
Kyle Edmund and Cameron Norrie were the defending champions, but chose not to participate this year.
Jonathan Erlich and Artem Sitak were the defending champions, but lost in the first round to Marcel Granollers and Sergiy Stakhovsky.
Luke Bambridge and Neal Skupski were the defending champions but only Bambridge chose to defend his title, partnering Ben McLachlan. Bambridge lost in the quarterfinals to Treat Huey and Adil Shamasdin.
Nicolas Mahut and Édouard Roger-Vasselin were the defending champions, but lost in the final to Robert Lindstedt and Jan-Lennard Struff, 6–2, 6–7(1–7), [4–10].
Luke Bambridge and Jonny O'Mara were the defending champions but only O'Mara chose to defend his title, partnering Ken Skupski. O'Mara lost in the semifinals to Hans Podlipnik Castillo and Tristan-Samuel Weissborn.
This was the first edition of the tournament.
Ben McLachlan and Jan-Lennard Struff were the defending champions, but chose not to participate together. McLachlan teamed up with Luke Bambridge, but lost in the first round to Divij Sharan and Artem Sitak. Struff played alongside Lucas Pouille, but lost in the semifinals to Nikola Mektić and Franko Škugor.
Luke Bambridge and Jonny O'Mara were the defending champions but chose to defend their title with different partners. Bambridge played alongside Ben McLachlan, but lost in the first round to Wesley Koolhof and Fabrice Martin. O'Mara teamed up with Ken Skupski, but lost in the first round to Mate Pavić and Bruno Soares.
Ben McLachlan and Jan-Lennard Struff were the defending champions, but Struff chose not to participate.
Kevin Krawietz and Andreas Mies were the defending champions for the tournament but chose to compete in Rotterdam instead of defending their title.
Bob and Mike Bryan were the defending champions and successfully defended their title, defeating Luke Bambridge and Ben McLachlan in the final, 3–6, 7–5, [10–5].
Defending champions Juan Sebastián Cabal and Robert Farah successfully defended their title, defeating Kevin Krawietz and Horia Tecău in the final, 6–4, 6–2, to win the doubles tennis title at the 2021 Barcelona Open. The top seeds did not drop a set en route to their 18th career ATP Tour doubles title together. Krawietz and Tecău were in contention to win their first title as a team.
Hugo Nys and Tim Pütz defeated Luke Bambridge and Dominic Inglot in the final, 7–5, 3–6, [10–3], to win the doubles tennis title at the 2021 Estoril Open. It was Nys and Pütz's first title as a team in their second tournament together on the ATP Tour, marking Nys's second and Pütz's third individual career tour-level doubles titles. Bambridge and Inglot were in contention for their first title as a team after reaching their first tour-level final without dropping a set.
Nikola Mektić and Mate Pavić defeated Marcel Granollers and Horacio Zeballos in the final, 6–4, 7–6(7–5), 2–6, 7–5 to win the gentlemen's doubles title at the 2021 Wimbledon Championships. It was their eighth title of the season, with Mektić winning his maiden major doubles title and Pavić winning his third. They became the first Croatian pair to win the title.
Marcel Granollers and Sergiy Stakhovsky were the reigning champions from when the tournament was last held in 2019, but chose not to defend their title.
Pablo Carreño Busta and Alex de Minaur were the defending champions, but Carreño Busta chose not to defend his title and de Minaur played alongside Cameron Norrie instead. They lost in the quarterfinals to Marcel Granollers and Horacio Zeballos.
Thanasi Kokkinakis and Nick Kyrgios defeated Matthew Ebden and Max Purcell in the final, 7–5, 6–4 to win the men's doubles tennis title in an all-Australian final at the 2022 Australian Open. They became the first all-Australian pair to win the title since Todd Woodbridge and Mark Woodforde in 1997, and the first wildcard champions in the Open Era. It marked the first all-Australian final since 1980.
Nikola Mektić and Mate Pavić defeated Nathaniel Lammons and Jackson Withrow in the final, 6–4, 6–7(5–7), [10–6] to win the men's doubles tennis title at the 2023 ASB Classic.
Marcel Granollers 
Ben McLachlan 
Kwon Soon-woo 
Ramkumar Ramanathan 
