Delbonis won five Challenger and Futures titles from the time he turned professional in 2009 until 2013.
2013 First ATP final
He qualified at the 2013 International German Open and beat Tommy Robredo, Dmitry Tursunov and Fernando Verdasco. He beat the Spaniard in a tight three-setter to set up a meeting in the semifinals with Roger Federer. Here, Delbonis scored by far the biggest win of his career, defeating Federer in two tiebreaks to book his place in his first ATP Tour final. He finished runner-up to Fabio Fognini, squandering a set and 4–1 lead and failing to convert three match points. This performance raised his ranking into the top 100 for the first time in his career.
2014 First ATP title
In 2014 he went on to win his first ATP title when he defeated Paolo Lorenzi, 4–6, 6–3, 6–4, 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. The win enabled to reach a new men's singles high ranking of 44.
2016: Second career title best season and best ranking
Delbonis started his season at the 2016 Apia International Sydney. He beat Sam Groth in the first round in straight sets. In his second round he played Teymuraz Gabashvili losing in straight sets 3–6, 3–6. Delbonis then played at the first major of the year at the 2016 Australian Open. In the first round he upset 22nd seed Ivo Karlović after Karlović had to retire in the third set. Delbonis then reached the third round of a major for the first time in his career after beating Renzo Olivo in the second round in five sets. He then lost in straight sets to 14th seed Gilles Simon 3–6, 2–6, 1–6.
Delbonis next played at the 2016 Argentina Open. He beat 6th seed Fabio Fognini in the first round after being a set down. He lost his second round match to eventual finalist Nicolás Almagro 3–6, 6–4, 4–6. Delbonis played in another clay court tournament at the 2016 Rio Open. In his first round he beat 6th seed Jack Sock in straight sets. He followed this up with another win in straight sets in the second round beating Paolo Lorenzi. He then lost in the quarterfinals against eventual champion Pablo Cuevas 4–6, 6–7(4–7). He then played in his third straight clay court tournament at the 2016 Brasil Open as the 4th seed. He got a bye pass in the first round. In the second round he beat Diego Schwartzman after being a set down. In the quarterfinals he lost to Íñigo Cervantes 6–7(6–8)6–2, 4–6.
Delbonis next competed at the first Masters 1000 of the year at the 2016 Indian Wells Masters. In the first round he defeated Santiago Giraldo in straight sets. In the second round he defeated 32nd seed João Sousa also in straight sets. In the third round Delbonis earned his biggest win of his career defeating 2nd seed Andy Murray in three sets 6–4, 4–6, 7–6(7–3). This was Delbonis's third top 10 win. In the fourth round he lost to 13th seed Gaël Monfils in straight sets 3–6, 4–6. Delbonis next competed at the 2016 Miami Open. In the first round he defeated wildcard Elias Ymer in three sets. In the second round he lost to 26th seed Grigor Dimitrov 6–7(8–10)6–4, 4–6.
Delbonis next chose to compete at the 2016 Grand Prix Hassan II as the 4th seed. He received a bye pass for the first round. In the second round he defeated Thiemo de Bakker in straight sets. He then defeated 7th seed Pablo Carreño Busta in the quarterfinals also in straight sets. In the semifinals In the semifinals he defeated Albert Montañés once again in straight sets. He won his second career title without dropping a set the entire tournament by defeating 3rd seed Borna Ćorić in the final 6–2, 6–4. He then competed at the 2016 Monte-Carlo Rolex Masters. He had a disappointing loss to wildcard Fernando Verdasco 0–6, 3–6. Delbonis then played at the 2016 BRD Năstase Țiriac Trophy as the 3rd seed. He received a bye pass in the first round. In the second round he defeated Illya Marchenko in straight sets. In the quarterfinals he defeated Marco Cecchinato also in straight sets. In the semifinals he lost to Lucas Pouille 3–6, 2–6.
Delbonis then competed at the 2016 Istanbul Open as the 4th seed. He received a bye pass for the first round. In the second round he defeated Dudi Sela in three sets. In the quarterfinal he defeated Albert Ramos-Viñolas in straight sets. In the semifinals he lost to eventual champion Diego Schwartzman despite winning the first set 7–6(7–5)3–6, 2–6. Delbonis then competed at the 2016 Geneva Open as the 6th seed. In the first round he defeated wildcard Janko Tipsarević in straight sets. In the second round he defeated last years champion Thomaz Bellucci in straight sets. In the quarterfinals he lost to 3rd seed and eventual runner up Marin Čilić 4–6, 3–6. Delbonis next competed at the second major of the year at the 2016 French Open as the 31st seed which marks the first time Delbonis has been seeded at a major. He was eliminated in the first round losing to Pablo Carreño Busta in four sets 6–7(3–7)7–6(7–4)4–6, 4–6.
Delbonis next competed at the third major of the year, the 2016 Wimbledon Championships. In the first round, he faced Fabio Fognini and lost in an epic five setter 4–6, 6–1, 7–6(7–3), 2–6, 3–6. Delbonis then played for Argentina in the Davis Cup quarterfinals against Italy. He beat Andreas Seppi and Fabio Fognini, both in four sets, to help clinch the tie 3–1. In the finals of Davis Cup, he lost against Marin Cilic in five sets but beat Ivo Karlovic in straight sets in the fifth and deciding rubber to give Argentina their first Davis Cup.[4]
(W) winner; (F) finalist; (SF) semifinalist; (QF) quarterfinalist; (#R) rounds 4, 3, 2, 1; (RR) round-robin stage; (Q#) qualification round; (P#) preliminary round; (DNQ) did not qualify; (A) absent; (Z#) Davis/Fed Cup Zonal Group (with number indication) or (PO) play-off; (G) gold, (S) silver or (B) bronze Olympic/Paralympic medal; (NMS) not a Masters tournament; (NTI) not a Tier I tournament; (P) postponed; (NH) not held; (SR) strike rate (events won / competed); (W–L) win–loss record.
To avoid confusion and double counting, these charts are updated at the conclusion of a tournament or when the player's participation has ended.
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Argentina
Fabio Fognini
Ernests Gulbis
Borna Ćorić
Wesley Koolhof
Artem Sitak
Roman Jebavý
Luke Bambridge
Sander Gillé
Guatemala F1
Nicolás Santos
Leonardo Tavares
Florian Mayer
Bucaramanga, Colombia
Wayne Odesnik
Filip Krajinović
Guillermo García López
Tim Goransson
Jorge Aguilar
Montevideo, Uruguay
Roger Federer
