Junior career As a junior Pella posted a 19–5 record in singles and reached as high as No. 42 in the combined world rankings in 2008. Entering as a qualifier, he reached the semifinals of the French Open boys' singles in 2008, upsetting first-seeded
Bernard Tomic in the quarterfinals (and losing to
Jerzy Janowicz).
2007–2011: Pro beginnings Pella started playing
Futures tournaments in 2005. In July 2008 He won his first F3 event in Peru without dropping a set. In the following years, he won six further Futures titles, all of them on clay. His first
Challenger final came at Guayaquil, Ecuador in November 2011, losing the match to
Matteo Viola in straight sets. He finished the 2011 season ranked world no. 350 in singles and no. 501 in doubles.
2012: Grand Slam & top 100 in singles & top 200 in doubles debut Pella started his
2012 Challenger season in March, capturing his first title in that category at the
Salinas Challenger in Ecuador, with a victory over
Paolo Lorenzi in the final round. The following month, he won his first doubles Challenger title at the
Pereira Challenger in Colombia, partnering
Martín Alund. In May, he entered the
French Open qualifying draw, losing in the first round to former world no. 2
Tommy Haas. In August, he won his first hard-court tournament at the
Manta Challenger, beating Maximiliano Estévez in the final. In the US Open, he made it through the
qualifying stage of the tournament, beating
Lukáš Rosol to reach his first Grand Slam main-draw match, which he lost to
Nikolay Davydenko in four sets. In September, he defeated
Alex Bogomolov Jr. and
Leonardo Kirche on his way to win the
Campinas Challenger in Brazil. He cracked the top 100 for the first time after winning the
2012 ATP Challenger Tour Finals, defeating
Adrian Ungur in the final round. Pella finished the year ranked world no. 97 in singles and world no. 187 in doubles, a career high and a 249-spots improvement since the beginning of the season.
2013: Grand Slam debuts at Australian & French & Wimbledon Guido Pella entered the
2013 Australian Open main draw directly, but he lost in the first round to qualifier
Amir Weintraub. He then competed in
Viña del Mar, also losing in the first round, this time to countryman
Federico Delbonis. The following week, he played at the
Brasil Open, winning his first ATP World Tour-level match against sixth seed
Fabio Fognini, losing then in the second round to eventual finalist
David Nalbandian. At 2013 Düsseldorf, he advanced to his first ATP semifinal starting as a qualifier, defeating No. 10
Janko Tipsarević along the way.
2019: First title & Major quarterfinal, top 20 in singles, top 55 in doubles Pella reached his fourth ATP Tour final in
Córdoba Open in February, but lost to compatriot
Juan Ignacio Londero in three sets. Having lost each of his previous four finals, in March 2019, he won his first ATP title at the
2019 Brasil Open. He defeated
Cristian Garín in straight sets. At the
2019 Mutua Madrid Open he reached the semifinals of a Masters 1000 for the first time, partnering
João Sousa where they lost to
Dominic Thiem and
Diego Schwartzman. Following this successful run, he entered the top 100 in doubles at World No. 99 on 13 May 2019. Later in June, at the
2019 French Open he also reached the semifinals in doubles for the first time in his career partnering with Schwartzman this time where they were defeated by eventual champions German duo
Kevin Krawietz and
Andreas Mies. As a result, he reached a career-high of No. 56 in doubles on 10 June 2019. At
Wimbledon in July, he reached his first-ever Grand Slam singles quarterfinal by defeating former World Number 3 and
2016 Wimbledon finalist
Milos Raonic in five sets from two sets down, but was then defeated by Roberto Bautista Agut. The victory marked his third against the most-recent runners-up of Wimbledon: He had previously defeated
2017 Wimbledon finalist
Marin Čilić in the second round of
2018 Wimbledon, also from two sets down, and
2018 Wimbledon finalist
Kevin Anderson in the third round of the 2019 championships. Following his successful runs at the Canada and Cincinnati Masters of third and second round respectively on his debut, he reached a career-high in singles of World No. 20 on 19 August 2019.
2020–2021: Major third round, ATP Cup He participated in the Inaugural
2020 ATP Cup where Argentina reached the quarterfinals and also in the
2021 ATP Cup where Argentina reached second place in their group (first place was Russia) and was eliminated from reaching the semifinals knockout stage. Seeded 22nd, Pella reached the third round at the
2020 Australian Open for the first time in his career where he lost to 12th seed
Fabio Fognini. He announced an indefinite break due to health issues but returned to the tour after 6 months at the
2020 US Open. At the
2021 Western & Southern Open Masters 1000 in Cincinnati he reached the third round by defeating 15th seed
David Goffin, and took his revenge for the loss at the Australian Open in 2020 by defeating Fabio Fognini in the second round.
2022–2023: Full season hiatus, Major third round, Retirement After a year hiatus, he entered the
2023 Australian Open using a protected ranking. Using also his protected ranking he reached the second rounds of the
2023 BNP Paribas Open and the
2023 Miami Open defeating
Thiago Monteiro and
Juan Pablo Varillas respectively. As a result, he jumped more the 250 positions back into the top 500. He entered the
Italian Open using protected ranking and reached the second round defeating
Maxime Cressy. He moved another 60 positions up in the top 450. At the
2023 French Open he also reached the second round defeating
Quentin Halys in five sets with a super tiebreak in the fifth, coming back from two sets to one down, and moved another 95 positions up in the top 350 in the rankings. At the
2023 Wimbledon Championships he defeated 13th seed
Borna Ćorić and qualifier
Harold Mayot to reach the third round. ==Performance timelines==