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.
He then lost in the third round to the eventual finalist Tomáš Berdych.
At the US Men's Clay Court Championships, he defeated Taylor Dent, Dudi Sela, and world No. 11 Fernando González for his first top-15 win and the biggest one of his career.
He then faced eventual champion Juan Ignacio Chela in the semifinals, where he lost in straight sets.
At the US Open, Zeballos, with partner Eduardo Schwank, reached the semifinals in doubles.
Zeballos played mostly on the Challenger circuit in singles.
He did not make it past the second round in any ATP events.
1985
Horacio Zeballos Jr. (Rioplatense Spanish: ; born 27 April 1985) is an Argentine professional tennis player.
2009
He has also reached the final in St. Petersburg in 2009, Russia, losing to Ukrainian Sergiy Stakhovsky.
Zeballos won the 2009 ATP Newcomer of the Year award.
2010
He reached his first doubles final at the Chile Open in Santiago in 2010, with partner Potito Starace.
They lost to top seeds Łukasz Kubot and Oliver Marach.
He won his first doubles title at the Argentina Open with Sebastián Prieto.
Zeballos is an Argentine of Spanish descent.
He enjoys music, ping-pong, and swimming.
His father is also named Horacio Zeballos, and his mother is named Carolina.
He has one sister, Carolina Jr. His favorite surface is clay, and Alejandro Lombardo coaches him.
Zeballos competed primarily on the ATP Challenger Tour, where he won five singles titles and six doubles titles.
He reached his first ATP Tour final at the St. Petersburg Open, defeating Yuri Schukin, Oleksandr Dolgopolov Jr., Ernests Gulbis and Igor Kunitsyn before falling in the final to Stakhovsky in a third-set tiebreak.
Zeballos started the singles season in a slump, falling in the first round four times, but had an excellent start to the doubles season.
In his first tournament, the Heineken Open, Zeballos and Rogier Wassen defeated the world No. 1 team Bob and Mike Bryan.
Zeballos then reached the round of 16 at the Australian Open with countryman Leonardo Mayer and reached the final at the Movistar Open with Italian Potito Starace.
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.
It was Zeballos' first ATP singles win since he reached the final in St. Petersburg.
Zeballos next defeated former world No. 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.
It was Zeballos' first career ATP title.
The following week, at the Abierto Mexicano Telcel, Zeballos lost in the first round to Łukasz Kubot.
He made it to the doubles semifinals with partner Mónaco.
Zeballos was selected for the Argentine Davis Cup team for the first time.
He played doubles with David Nalbandian against the Swedish pair of Robert Lindstedt and Robin Söderling.
They won in straight sets.
2011
He had more success in doubles, where he won his second title at the 2011 BMW Open partnering Simone Bolelli.
2012
In 2012, he made it to the semifinals in Viña de Mar and Buenos Aires.
At Roland Garros, he and partner Oliver Marach made it to the quarterfinals, where they were beaten by the Bryan brothers.
2013
His career-high singles ranking is world No. 39, achieved in March 2013, and his career-high doubles ranking is world No. 3, achieved in September 2019.
Zeballos won his first ATP title at the 2013 VTR Open in Chile on 10 February.
In the final, he beat Rafael Nadal, becoming one of only four players (with Roger Federer, Novak Djokovic and Andy Murray) to beat Nadal in a clay-court final.
2017
In singles, he has reached the fourth round at the French Open, doing so in 2017.
2019
In doubles, he has reached the men's doubles finals at the 2019 US Open and at Wimbledon in 2021 and 2023 alongside Marcel Granollers.
