Marcel Garnollers and Horacio Zeballos advance to the Madrid doubles quarter-finals.

Horacio Zeballos and Marcel Granollers barely put a foot wrong on Tuesday in the first set against Nikola Mektic and Mate Pavic at the Nitto ATP Finals.

Horacio Zeballos and Marcel Granollers overcome Jonny O'Mara and Aisam-Ul-Haq Qureshi on Monday at the US Open.

Marcel Granollers and Horacio Zeballos become the first team since Bob Bryan and Mike Bryan in 2003 to triumph in Cincinnati without dropping a set.

Marcel Granollers and Horacio Zeballos become the first team since Bob Bryan and Mike Bryan in 2003 to triumph in Cincinnati without dropping a set.

Horacio Zeballos and Marcel Granollers defeat Marcelo Arevalo and Fabio Fognini on Saturday in Cincinnati to reach their second ATP Masters 1000 final of the season.

Marcel Granollers and Horacio Zeballos defeat Alex de Minaur and Cameron Norrie on Friday in Cincinnati.

Marcel Granollers and Horacio Zeballos won the Madrid doubles title on Sunday with victory over Nikola Mektic and Mate Pavic.

Marcel Granollers (right) and Horacio Zeballos (left) celebrate winning the Madrid doubles title on Sunday.

Moment of celebration: Marcel Granollers and Horacio Zeballos win the Madrid doubles title on Sunday.

Marcel Granollers and Horacio Zeballos celebrate winning the Madrid title on Sunday.

Marcel Granollers (right) and Horacio Zeballos (left) are chasing their fourth team title of 2020.

Marcel Granollers (right) and Horacio Zeballos (left) own a 23-6 record in 2020.

Marcel Granollers and Horacio Zeballos own four tour-level titles as a team.

Marcel Granollers (right) and Horacio Zeballos (left) have reached four finals from as many clay events this year.

Marcel Granollers and Horacio Zeballos own a 3-1 record in clay finals this year.

Marcel Granollers and Horacio Zeballos are attempting to lift their second ATP Masters 1000 trophy this week.

Marcel Granollers and Horacio Zeballos triumph in Rio de Janeiro, lifting their third ATP Tour title as a team.

Horacio Zeballos and Marcel Granollers sprint into the quarter-finals at the Rio Open presented by Claro.

Marcel Granollers and Horacio Zeballos are through to the doubles semi-finals at the US Open.

Marcel Granollers and Horacio Zeballos beat Robin Haase and Wesley Koolhof in the Montreal final to lift the Coupe Rogers trophy.

Marcel Granollers and Horacio Zeballos do not face a break point en route to clinching the Montreal title on Sunday.

Horacio Zeballos and Marcel Granollers will play Robin Haase and Wesley Koolhof in the Montreal final.

Marcel Granollers and Sergiy Stakhovsky made their team debut a memorable one by winning the Hall of Fame Open.