2000–2004 Peralta turned pro in 2000, and had his best year in his singles career in 2003, year which he won a
challenger tournament, the
BH Tennis Open International Cup in
Belo Horizonte. He retired in 2005.
2007–2008 He made a comeback in 2007 at
ITF Futures tournaments. Julio competed throughout 2008, but he suffered an injury the next year.
2011: Second comeback He made his comeback (after long, exhausting, two-year injury) in the
2011 Sparkassen Open, winning comfortably the first two qualifying rounds, against Stefan Seifert and
David Goffin (no. 220). In the main tournament, he defeated
Victor Crivoi.
2014: Third comeback After a long hiatus, he returned in September at the
2014 Napa Valley Challenger doubles tournament partnering
Matt Seeberger as a wildcard pair. In early November, he won the titles in both singles and doubles USA F30 tournament, not dropping a single set in the main draw in both tournaments. In Chile F9 tournament he made the singles final, losing to
Hans Podlipnik Castillo and the following week won the doubles tournament in Chile F10 partnering Seeberger.
2015: New partnership and Challenger Tour success Peralta played many
Challenger Tour tournaments during the year, reaching seven finals and winning four, partnering
Horacio Zeballos in three of these titles. With the victories, Peralta rose almost 400 positions in the rankings, ending the year at No. 105.
2016: Three ATP Doubles titles He broke through onto the ATP World Tour doubles circuit in 2016, winning the
Brazil Open, the
Swiss Open and the
Moselle Open with Horacio Zeballos. He won his first match in a
Grand Slam at the
French Open, partnering
Denis Kudla, but the duo lost in the second round. Peralta also won six
challenger tournaments, partnering Zeballos in four, in one with
Dennis Novikov, and at
Santiago with countryman
Hans Podlipnik. Peralta tied with
Matt Reid and
John-Patrick Smith for most Challenger titles in doubles for the year. Peralta finished the year ranked No. 44 in the world in doubles, and the highest ranked Chilean player in singles or doubles, record he has held since then.
2017: Another title, French Open quarterfinals, top 30 debut Peralta and Zeballos reached the final of the
Ecuador Open, but lost to
James Cerretani and
Philipp Oswald. They went on to win the
U.S. Men's Clay Court Championships. At the
French Open, he partnered Zeballos to reach the quarterfinals. This saw his ranking jump to a career high of No. 35. In the rest of the year, Peralta reached two more tournament finals with Zeballos, and another one with
Santiago González, with whom he reached quarterfinals at the
2017 Shanghai Rolex Masters too. Peralta ended the year at World No. 29, his best position yet.
2018: First ATP 500 & one more titles Peralta had a slow beginning of the year, with semifinals at
2018 ASB Classic as the only notable result. Julio and Horacio Zeballos reunited for attempting a defense of their title in the
U.S. Men's Clay Court Championships, but they lost in first round. They also tried to imitate their past year quarterfinals run on the French Open, but they lost in second round. Partnering with
Roman Jebavý, they reached semifinals of the
2018 Antalya Open. Peralta and Zeballos partnered again for the
2018 Wimbledon and won over 16th seeds
Max Mirnyi and
Philipp Oswald in first round, but then lost in second round. The partnership went on and they won the
2018 Swedish Open, defeating in the final the Italian pair
Simone Bolelli and
Fabio Fognini. The following week Peralta and Zeballos won another title, the
2018 German Open, his first on the
ATP 500 level, defeating
Oliver Marach and
Mate Pavić in the final.
2022: Back on the ATP tour After almost 4 years of hiatus, Peralta came back on the ATP tour in April where he entered the
2022 BMW Open with
Franko Škugor with a protected ranking and next at the
Italian Open as an alternate pair also with Škugor where they won their first round match against top 50 players
Tomislav Brkić and
Nikola Ćaćić. == Personal life ==