Federico Delbonis[1] (Spanish pronunciation: [feðeˈɾiko ðelˈβonis];[3][a] born 5 October 1990) is an Argentine former professional tennis player.

Delbonis won five Challenger and Futures titles from the time he turned professional in 2009 until 2013.

In 2011, Delbonis reached the first ATP semifinal of his career at the Mercedes Cup in Stuttgart, Germany.

[4] He qualified at the 2013 International German Open and then beat Tommy Robredo, Dmitry Tursunov and Fernando Verdasco, the latter of which he won in a tight three-setter to set up a meeting in the semifinals with Roger Federer.

He finished runner-up to Fabio Fognini, squandering a set and 4–1 lead and failing to convert three match points.

Due to his strong performance, his tour ranking soared into the top 100 for the first time in his career.

In 2014 he went on to win his first ATP title when he defeated Paolo Lorenzi in three sets, at the 2014 Brasil Open.

It was their first tour level match against each other, however Lorenzi has won against Delbonis in past three Challenger events.

He then played in his third straight clay court tournament at the 2016 Brasil Open as the 4th seed.

In the third round Delbonis earned his biggest win of his career defeating 2nd seed Andy Murray in three sets.

Delbonis next chose to compete at the 2016 Grand Prix Hassan II as the 4th seed.

He beat Andreas Seppi and Fabio Fognini, both in four sets, to help clinch the tie 3–1.

With his best showing at a Masters, he returned to the top 50 in the singles rankings in over 4 years, since March 2017.

In the lead-up to the French Open, Delbonis also played in the second tournament in Belgrade, where he reached the semifinals, losing to qualifier Alex Molčan.

Delbonis made his best Grand Slam run in his career by reaching the fourth round at the French Open, having never being past the second round at a Major, after defeating Radu Albot, Pablo Andújar and 27th seed Fabio Fognini.

He reached the semifinals at the 2022 Argentina Open defeating again Fabio Fognini[8] before losing to eventual champion Casper Ruud.

He recorded his only Major win for the season at the 2022 French Open against Adrian Mannarino.

He announced his retirement on 29 January 2024 with his last appearance being at the 2024 Argentina Open in doubles partnering Facundo Bagnis.