Thiago Agustín Tirante (born 10 April 2001) is an Argentine professional tennis player. He has a career-high ATP singles ranking of world No. 90, achieved on 15 April 2024 and a doubles ranking of No. 257, achieved on 1 November 2021.

He achieved a career-high ITF juniors year-end ranking of No. 1 in the world in 2019.^[1] Tirante won the 2019 French Open – Boys' doubles title.^[2]

He won his maiden Challenger title at the 2021 Ambato La Gran Ciudad in Ecuador.

He reached the final of the 2023 Mexico City Open where he lost to Dominik Koepfer. He reached the top 150 on 8 May 2023 following his second Challenger title at the 2023 Morelos Open in Mexico defeating top seed James Duckworth.^[3]

Ranked No. 153, he made his Grand Slam main draw debut at the 2023 French Open defeating Dominic Stricker in the last round of qualifying. He won his first Grand Slam match defeating 25th seed Botic van de Zandschulp.^[4]

In August, he made his ATP debut at the 2023 Los Cabos Open and recorded his first win at an ATP tournament over qualifier Gonzalo Lama.^[5] He won his third Challenger at the 2023 Open Bogotá over Gustavo Heide and reached a new career-high ranking of No. 111 on 2 October 2023.^[6] At the same tournament, he also won the doubles title with Renzo Olivo.

At the 2024 Córdoba Open, he reached the main draw as a lucky loser and recorded his third ATP win over an ATP debutant, wildcard Francisco Comesaña. He reached the top 100 following the 2024 Rio Open on 26 February 2024.^[7] Next he defeated João Fonseca in Santiago.^[8]

He won his fourth Challenger at the 2024 Mexico City Open without dropping a set and reached a new singles career-high of No. 91 on 8 April 2024.^[9][10]

In July, Tirante reached his first ATP Tour semifinal at the 2024 Swedish Open after a run which included wins over world No. 8 and defending champion, Andrey Rublev, his first top 10 win,^[11] and Roberto Carballés Baena in the quarterfinals,^[12] before losing to Nuno Borges.^[13]

Result	W–L	Date	Tournament	Tier	Surface	Opponent	Score
Loss	0–1	Nov 2020	Lima, Peru	Challenger	Clay	Daniel Elahi Galán	1–6, 6–3, 3–6
Loss	0–2	Jul 2021	Trieste, Italy	Challenger	Clay	Tomás Martín Etcheverry	1–6, 1–6
Win	1–2	Sep 2021	Ambato, Ecuador	Challenger	Clay	Juan Pablo Varillas	7–5, 7–5
Loss	1–3	Aug 2022	Lima, Peru	Challenger	Clay	Camilo Ugo Carabelli	2–6, 6–7(4–7)
Loss	1–4	Mar 2023	Ciudad de México, Mexico	Challenger	Clay	Dominik Koepfer	6–2, 4–6, 2–6
Win	2–4	Apr 2023	Cuernavaca, Mexico	Challenger	Hard	James Duckworth	7–5, 6–0
Win	3–4	Sep 2023	Bogotá, Colombia	Challenger	Clay	Gustavo Heide	walkover
Win	4–4	Apr 2024	Ciudad de México, Mexico	Challenger	Clay	Alexis Galarneau	6–1, 6–3
Loss	4–5	Nov 2024	São Paulo, Brazil	Challenger	Hard	Francisco Comesaña	5–7, 6–4, 4–6

Result	W–L	Date	Tournament	Tier	Surface	Partner	Opponents	Score
Loss	0–1	Feb 2020	Punta del Este, Uruguay	Challenger	Clay	Juan Manuel Cerúndolo	Orlando Luz Rafael Matos	4–6, 2–6
Loss	0–2	May 2021	Salinas II, Ecuador	Challenger	Hard	Antonio Cayetano March	Nicolás Barrientos Sergio Galdós	walkover
Win	1–2	Sep 2021	Quito, Ecuador	Challenger	Clay	Alejandro Gómez	Adrián Menéndez Maceiras Mario Vilella Martínez	7–5, 6–7(5–7), [10–8]
Loss	1–3	Sep 2021	Ambato, Ecuador	Challenger	Clay	Alejandro Gómez	Diego Hidalgo Cristian Rodríguez	3–6, 6–4, [3–10]
Loss	1–4	Jul 2022	Troyes, France	Challenger	Clay	Juan Bautista Torres	Íñigo Cervantes Oriol Roca Batalla	1–6, 2–6
Win	2–4	Oct 2022	Ambato, Ecuador	Challenger	Clay	Santiago Rodríguez Taverna	Benjamin Lock Courtney John Lock	7–6(13–11), 6–3
Win	3–4	Sep 2023	Bogotá, Colombia	Challenger	Clay	Renzo Olivo	Orlando Luz Guillermo Durán	7–6(8–6), 6–4

Result	W–L	Date	Tournament	Tier	Surface	Opponent	Score
Loss	0–1	Aug 2019	M15 Cancún, Mexico	WTT	Hard	Ronan Joncour	6–3, 5–7, 1–6
Win	1–1	Oct 2020	M15 Monastir, Tunisia	WTT	Hard	Wojciech Marek	7–6(7–2), 6–7(4–7), 6–3
Loss	1–2	Oct 2020	M15 Monastir, Tunisia	WTT	Hard	Skander Mansouri	4–6, 6–3, 6–7(5–7)

Result	W–L	Date	Tournament	Tier	Surface	Partner	Opponents	Score
Win	1–0	Aug 2019	M15 Cancún, Mexico	WTT	Hard	Shintaro Mochizuki	Isaac Stoute Brandon Walkin	6–7(4–7), 7–5, [10–4]
Loss	1–1	Sep 2020	M15 Monastir, Tunisia	WTT	Clay	Matias Franco Descotte	Aristotelis Thanos Petros Tsitsipas	3–6, 4–6
Loss	1–2	Oct 2020	M15 Monastir, Tunisia	WTT	Hard	Luis Patiño	Maik Steiner Patrick Zahraj	6–4, 4–6, [8–10]

Result	Year	Tournament	Surface	Partner	Opponents	Score
Win	2019	French Open	Clay	Matheus Pucinelli de Almeida	Flavio Cobolli Dominic Stricker	7–6(7–3), 6–4

• Tirante's record against players who were, at the time the match was played, ranked in the top 10.

No.	Player	Rank	Tournament	Surface	Rd	Score	Rk
2024
1.	Andrey Rublev	8	Båstad, Sweden	Clay	2R	7–6(7–5), 3–6, 6–4	121

• Thiago Agustín Tirante at the Association of Tennis Professionals
• Thiago Agustín Tirante at the International Tennis Federation

Awards and achievements
Preceded by Tseng Chun-hsin	ITF Junior World Champion 2019	Succeeded by Shang Juncheng