Mike Bryan and Jack Sock were the defending champions, but Sock could not participate due to injury. Mike Bryan played alongside his brother Bob, but lost in the third round to Nicolas Mahut and Édouard Roger-Vasselin.
Juan Sebastián Cabal and Robert Farah won their second consecutive Grand Slam men's doubles title, defeating Marcel Granollers and Horacio Zeballos in the final, 6–4, 7–5 to win the men's doubles tennis title at the 2019 US Open. Cabal and Farah retained the ATP no. 1 doubles ranking. Mike Bryan, Łukasz Kubot and Nicolas Mahut were also in contention for the top ranking at the start of the tournament.
Łukasz Kubot and Marcelo Melo were the defending champions, but lost to Mate Pavić and Bruno Soares in the final, 4–6, 2–6.
Dominic Inglot and Franko Škugor were the defending champions, but Inglot decided to compete in Vienna instead. Škugor played alongside Nikola Mektić, but they lost to Jean-Julien Rojer and Horia Tecău in the first round.
Mike Bryan and Jack Sock were the defending champions, but Sock did not qualify this year. Bryan qualified alongside his brother Bob, but they withdrew before the tournament began.
Kevin Krawietz and Andreas Mies were the defending champions and successfully defended their title, defeating Mate Pavić and Bruno Soares in the final, 6–3, 7–5.
Pierre-Hugues Herbert and Nicolas Mahut were the defending champions but Mahut chose not to participate. Herbert partnered Jan-Lennard Struff, but they lost in the quarterfinals to Nikola Mektić and Mate Pavić.
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.
Marcel Granollers and Horacio Zeballos defeated Nikola Mektić and Mate Pavić in the final, 1–6, 6–3, [10–8], to win the men's doubles tennis title at the 2021 Madrid Open. It was the third-seeded duo's third ATP Tour Masters 1000 doubles title together. Mektić and Pavić were contending to be the first doubles team in five years to win a season's first three Masters 1000 events.
Nicolas Mahut and Pierre-Hugues Herbert defeated Alexander Bublik and Andrey Golubev in the final, 4–6, 7–6(7–1), 6–4, to win the men's doubles title at the 2021 French Open. It was their second French Open title and fifth major title together. They saved match points in their semifinal match against Juan Sebastián Cabal and Robert Farah. Bublik and Golubev became the first male Kazakhstani players to reach a major final.
Raven Klaasen and Michael Venus were the defending champion from when the event was last held in 2019, but they decided not to participate together this year. Klaasen played alongside Ben McLachlan but lost in the second round to Andrés Molteni and Guido Pella. Venus played alongside Tim Pütz but lost in the semifinals to Félix Auger-Aliassime and Hubert Hurkacz.
The 2021 Hamburg European Open was a combined men's and women's tennis tournament played on outdoor clay courts. It was the 115th edition of the event for the men and the 19th edition for the women, after last tournament being held in 2002. The tournament was classified as a WTA 250 tournament on the 2021 WTA Tour and as an ATP Tour 500 series on the 2021 ATP Tour. The tournament took place at the Am Rothenbaum in Hamburg, Germany between 6 and 18 July 2021.
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 8th title of the year, with Mektić winning his first major title in doubles and Pavić winning his third, following previous victories at the 2018 Australian Open and 2020 US Open. They also became the first Croatian pair to win the Wimbledon doubles title.
Andrey Rublev was the defending champion, but chose to not defend his title as he and other Russian Olympic athletes were sent to Yuzhno-Sakhalinsk for training sessions.
The 2021 Winston-Salem Open was a men's tennis tournament played on outdoor hard courts. It was the 52nd edition of the Winston-Salem Open, and part of the ATP Tour 250 Series of the 2021 ATP Tour. It took place at Wake Forest University in Winston-Salem, North Carolina, United States, from August 21 through August 28, 2021. It was the last event on the 2021 US Open Series before the 2021 US Open.
Marcel Granollers and Horacio Zeballos were the defending champions from when the tournament was last held in 2019, but withdrew before the tournament began.
Tim Pütz and Michael Venus defeated Pierre-Hugues Herbert and Nicolas Mahut in the final, 6–3, 6–7(4–7), [11–9], to win the doubles title at the 2021 Paris Masters.
Tim Pütz and Michael Venus defeated Nikola Mektić and Mate Pavić in the final, 6–3, 6–7(5–7), [16–14] to win the doubles tennis title at the 2022 Dubai Tennis Championships. The pair saved three championship points en route to the win.
The 2022 Barcelona Open Banc Sabadell was a men's tennis tournament played on outdoor clay courts at the Real Club de Tenis Barcelona in Barcelona, Spain, from 18 to 24 April 2022. It was the 69th edition of the event and part of the ATP Tour 500 series of the 2022 ATP Tour.
Kevin Krawietz and Andreas Mies defeated Wesley Koolhof and Neal Skupski in the final, 6–7(3–7), 7–6(7–5), [10–6] to win the doubles tennis title at the 2022 Barcelona Open.
Tim Pütz 
Michael Venus 
Horia Tecău 
