[3] He also reached the fourth round at the French Open, doing so in 2017, and the final in St. Petersburg in 2009, Russia, losing to Ukrainian Sergiy Stakhovsky.

Zeballos then turned to the clay in the Copa Telmex in Argentina, where in the first round, he defeated countryman and former French Open champion Gastón Gaudio.

1 Carlos Moyá and reached his first ATP quarterfinal since October, where he then lost to countryman Juan Mónaco.

In doubles, Zeballos and countryman Sebastián Prieto were the fourth seed and won the title against Simon Greul and Peter Luczak.

Zeballos reached a career milestone as he defeated his first-ever top-25 player, 24th ranked Gilles Simon, in the second round at the Sony Ericsson Open.

At the US Men's Clay Court Championships, he defeated Taylor Dent, Dudi Sela, and world No.

He then faced eventual champion Juan Ignacio Chela in the semifinals, where he lost in straight sets.

Zeballos won his first ATP singles title at Viña del Mar, where he defeated Rafael Nadal in three sets in his comeback tournament.

[3] This victory made Zeballos one of the only four players who have beaten Nadal in a final on clay (the others are Roger Federer, Novak Djokovic and Andy Murray).

With his new partner Marcel Granollers, Zeballos won 6 titles starting in August 2019, and also made his first Grand Slam doubles final at the 2019 US Open, losing to the world No.

At the 2023 French Open they upset top seeds Wesley Koolhof and Neal Skupski to reach back-to-back semifinals.

[11] At the 2024 BNP Paribas Open in Indian Wells, Zeballos and Granollers reached the final, saving a match point.

[14] At the next Masters 1000, the 2024 Mutua Madrid Open, Zeballos and Granollers reached the quarterfinals and both moved into a new career-high ranking of No.

With reaching their fourth Masters semifinal of the season, with a win over Hugo Nys and Jan Zielinski, they became joint World No.

At the 2024 French Open, they reached their third consecutive semifinal at this Major defeating 15th seeds Hugo Nys and Jan Zieliński, and then Tomas Machac and Zhang Zhizhen.

[19] He won his eighth Masters title at the 2024 National Bank Open, second for the year and at this tournament, and tenth as a team with Granollers.