2018: ATP debut

Martínez made his ATP main draw debut at the 2018 Grand Prix Hassan II after qualifying for the singles main draw.

2019-2020: Major singles & doubles debut, top 100 singles debut

Martínez made his Grand Slam debut in the main draw at the 2019 French Open in singles and at the 2020 French Open in doubles with Christian Garin.

He reached his first ATP quarterfinal in his career at the ATP 500 2020 Rio Open in Brazil defeating Hugo Dellien and Pablo Andujar.

In June, he made the third round of the 2020 French Open in singles, his best Grand Slam result thus far. As a result he entered the top 100 in singles at World No. 97 on 12 October 2020.

2021: French Open doubles semifinal & top 100, first ATP final, top 60 in singles

Martínez at the 2021 French Open

Martínez reached the third round of the 2021 Australian Open in singles for the first time at this Major, defeating Emil Ruusuvuori, his second showing at this level in his career.

At the 2021 French Open he reached the semifinals as alternate in doubles with fellow Spaniard Pablo Andujar,^[2] with whom he also made his Grand Slam doubles debut as a pair at the 2021 Australian Open. They defeated the 14th seeded Belgians Sander Gillé/Joran Vliegen in the third round and the pair of Rohan Bopanna/Franko Skugor in the quarterfinals. They entered the tournament as a replacement alternate pair for the top seeds Nikola Mektić/Mate Pavić. As a result Martínez made his top 100 debut in doubles at world No. 95 for the first time in his career on 14 June 2021.

On his debut, Martínez reached the third round of the 2021 Wimbledon Championships in singles for the first time in his career, defeating 13th seed Gael Monfils, his third showing in the third round of a Grand Slam.

Martínez reached his first ATP final at the 2021 Generali Open Kitzbühel where he was defeated by Casper Ruud. He secured the biggest win of his career when he overcame world No. 16 Roberto Bautista Agut en route to the championship match.^[3] He also reached the semifinals at the same tournament partnering Marc Polmans. As a result he reached a new career-high singles ranking of world No. 76 and a doubles ranking of No. 88 on 2 August 2021. At the 2021 US Open he recorded his first win at this Major over James Duckworth to reach the second round. After winning the Challenger in Seville, he reached a career high ranking of world No. 59 on 13 September 2021.

At the 2021 Kremlin Cup he was defeated by Marin Cilic in only the second quarterfinal of the season and third in his career at ATP level. He reached a career-high singles ranking of No. 58 on 25 October 2021. At the same tournament, he also reached the semifinals partnering Ilya Ivashka. As a result he returned to a doubles ranking of No. 87 on 25 October 2021 tied with his best ranking thus far.

2022: ATP Cup finalist, first ATP singles & doubles titles, Top 40 in singles

Martínez participated for the first time in the 2022 ATP Cup as part of the Spanish team where he played doubles with Alejandro Davidovich Fokina (won both matches) and Albert Ramos Vinolas (lost both matches) and helped Spain reach the final.

Martínez reached the third round of the 2022 Australian Open in doubles for the first time at this Major partnering compatriot Pablo Andujar. As a result he reached a new career-high doubles ranking of World No. 72 on 31 January 2022.

Martinez was seeded fourth in Santiago. After receiving a first round bye, he defeated Jaume Munar, Yannick Hanfmann and Alejandro Tabilo to reach his second ATP final.^[4] He beat Sebastián Báez in the final to win his first ATP title.^[5] As a result he made his top 50 debut on 28 February 2022.^[6]

He reached the third round of a Masters 1000 for the first time in his career at the 2022 Miami Open defeating Jan-Lennard Struff and upset 27th seed Cristian Garín.

He made his top 40 debut following the 2022 Mutua Madrid Open on 9 May 2022.

At the 2022 Rakuten Japan Open Tennis Championships he reached the quarterfinals for a second time at an ATP 500 tour-level, defeating Alexei Popyrin and Jaume Munar.^[7]

2023: Loss of form, out of top 100

As a result of a couple of first round losses in the beginning of the season, his ranking fell outside the top 100 after the 2023 Rio Open and as low as No. 120 after the 2023 Chile Open for not being able to defend his title in Santiago.

Ranked No. 142, at the 2023 Italian Open he qualified for the main draw but lost in the first round to Alexander Bublik. At the 2023 French Open he again qualified for the main draw defeating Facundo Bagnis in the last of round qualifying but lost to Tallon Griekspoor in the first round.

Singles

Current through the 2024 Australian Open qualifying.

Doubles

Singles: 2 (1 title, 1 runner-up)

Result	W–L	Date	Tournament	Tier	Surface	Opponent	Score
Loss	0–1	Jul 2021	Kitzbühel Open, Austria	250 Series	Clay	Casper Ruud	1–6, 6–4, 3–6
Win	1–1	Feb 2022	Chile Open, Chile	250 Series	Clay	Sebastián Báez	4–6, 6–4, 6–4

Doubles: 1 (1 title)

Result	W–L	Date	Tournament	Tier	Surface	Partner	Opponents	Score
Win	1–0	Jul 2022	Austrian Open Kitzbühel, Austria	250 Series	Clay	Lorenzo Sonego	Tim Pütz Michael Venus	5–7, 6–4, [10–8]

Singles: 22 (12 titles, 10 runner–ups)

Result	W–L	Date	Tournament	Tier	Surface	Opponent	Score
Loss	0–1	Jun 2015	France F11, Toulon	Futures	Clay	Alexis Musialek	6–1, 2–6, 3–6
Loss	0–2	Jul 2015	Spain F20, Getxo	Futures	Clay	Alexander Ward	1–6, 1–6
Win	1–2	Mar 2016	Croatia F3, Pula	Futures	Clay	Zdeněk Kolář	6–3, 6–1
Loss	1–3	May 2016	Tunisia F16, Hammamet	Futures	Clay	Omar Salman	6–2, 5–7 ret.
Win	2–3	Jun 2016	Bulgaria F3, Stara Zagora	Futures	Clay	Germain Gigounon	6–3, 6–1
Win	3–3	Jun 2016	Bulgaria F4, Plovdiv	Futures	Clay	Dimitar Kuzmanov	7–6(5), 6–2
Loss	3–4	Jul 2016	Spain F20, Getxo	Futures	Clay	Ricardo Ojeda Lara	1–6, 4–6
Win	4–4	Jul 2016	Spain F23, Xàtiva	Futures	Clay	Carlos Taberner	2–6, 6–1, 6–4
Loss	4–5	Feb 2017	Spain F3, Peguera	Futures	Clay	Stefano Travaglia	5–7, 1–6
Win	5–5	Apr 2017	Tunisia F16, Hammamet	Futures	Clay	Lamine Ouahab	6–3, 6–3
Win	6–5	May 2017	Spain F12, Lleida	Futures	Clay	Gerard Granollers Pujol	6–3, 5–7, 6–4
Win	7–5	Aug 2017	Spain F26, Santander	Futures	Clay	Marc Giner	6–3, 6–2
Win	8–5	Feb 2018	Egypt F3, Sharm El Sheikh	Futures	Hard	Vladyslav Manafov	3–6, 6–3, 6–2
Loss	8–6	Jun 2018	Spain F14, Huelva	Futures	Clay	Sergio Gutiérrez Ferrol	6–3, 6–7(1), 2–6
Win	9–6	Jul 2018	Båstad, Sweden	Challenger	Clay	Corentin Moutet	7–6(5), 6–4
Loss	9–7	Oct 2018	Barcelona, Spain	Challenger	Clay	Roberto Carballés Baena	6–1, 3–6, 0–6
Loss	9–8	Apr 2019	Alicante, Spain	Challenger	Clay	Pablo Andújar	3–6, 6–3, 4–6
Loss	9–9	Oct 2020	Alicante, Spain	Challenger	Clay	Carlos Alcaraz	6–7(6), 3–6
Win	10–9	Nov 2020	Marbella, Spain	Challenger	Clay	Jaume Munar	7–6(4), 6–2
Win	11–9	Sep 2021	Seville, Spain	Challenger	Clay	Roberto Carballés Baena	6–4, 6–1
Loss	11–10	Sep 2023	Como, Italy	Challenger	Clay	Thiago Seyboth Wild	7–5, 2–6, 3–6
Win	12–10	Oct 2023	Brest, France	Challenger	Hard (i)	Benjamin Bonzi	7–6(8–6), 7–6(7–1)

Doubles: 38 (22 titles, 16 runner–ups)

Result	W–L	Date	Tournament	Tier	Surface	Partner	Opponents	Score
Win	1–0	Feb 2014	Spain F1, Peguera	Futures	Clay	Jaume Munar	Roberto Carballés Baena Oriol Roca Batalla	6–1, 6–1
Win	2–0	Sep 2014	Spain F26, Madrid	Futures	Hard	Jaume Munar	Adam Sanjurjo Hermida Miguel Semmler	6–3, 6–4
Win	3–0	Jul 2015	Spain F20, Getxo	Futures	Clay	Eduard Esteve Lobato	Ivan Gakhov Alexander Igoshin	6–1, 6–2
Win	4–0	Jul 2015	Spain F21, Gandia	Futures	Clay	Eduard Esteve Lobato	Carlos Boluda-Purkiss Alberto Romero de Ávila Senise	6–1, 6–2
Loss	4–1	Aug 2015	Spain F26, Vigo	Futures	Clay	Eduard Esteve Lobato	Sergio Martos Gornés Pol Toledo Bagué	4–6, 3–6
Win	5–1	Sep 2015	Spain F28, Oviedo	Futures	Clay	Gerard Granollers	Adrien Puget Xavier Pujo	7–5, 6–4
Loss	5–2	Mar 2016	Croatia F3, Pula	Futures	Clay	Jaume Munar	Paweł Ciaś Grzegorz Panfil	6–4, 3–6, [6–10]
Loss	5–3	May 2016	Tunisia F16, Hammamet	Futures	Clay	Carlos Calderón Rodríguez	Catalin Gard Andreas Mies	6–7(3), 6–7(1)
Loss	5–4	May 2016	Spain F13, Valldoreix	Futures	Clay	Carlos Calderón Rodríguez	Álvaro López San Martín Jaume Munar	3–6, 6–3, [5–10]
Loss	5–5	Jun 2016	Bulgaria F3, Stara Zagora	Futures	Clay	Carlos Calderón Rodríguez	Vasko Mladenov Yan Sabanin	2–6, 6–7(2)
Win	6–5	Jun 2016	France F11, Toulon	Futures	Clay	Lamine Ouahab	Ronan Joncour Yanais Laurent	6–3, 6–7(4), [12–10]
Loss	6–6	Jul 2016	France F12, Montauban	Futures	Clay	Lamine Ouahab	Tomislav Brkić Caio Zampieri	1–6, 2–6
Win	7–6	Jul 2016	Spain F23, Xàtiva	Futures	Clay	Alberto Barroso Campos	Francesc Aulina Juan Lizariturry	6–4, 6–1
Win	8–6	Sep 2016	Spain F28, San Sebastián	Futures	Clay	Eduard Esteve Lobato	Alexis Klégou Maxime Mora	6–3, 3–6, [10–4]
Loss	8–7	Sep 2016	Meknes, Morocco	Challenger	Clay	Oriol Roca Batalla	Luca Margaroli Mohamed Safwat	4–6, 4–6
Win	9–7	Jan 2017	Spain F1, Manacor	Futures	Clay	Ricardo Ojeda Lara	Sergio Martos Gornés David Vega Hernández	6–7(5), 6–0, [10–4]
Win	10–7	Feb 2017	Spain F3, Peguera	Futures	Clay	Gerard Granollers	Filippo Leonardi Stefano Travaglia	6–7(5), 6–0, [10–4]
Win	11–7	Feb 2017	Spain F4, Peguera	Futures	Clay	Gerard Granollers	Sergio Martos Gornés Cristóbal Saavedra Corvalán	6–3, 6–4
Loss	11–8	Feb 2017	Spain F5, Murcia	Futures	Clay	Oriol Roca Batalla	Ivan Gakhov David Vega Hernández	7–5, 3–6, [8–10]
Win	12–8	Mar 2017	Spain F7, Xàbia	Futures	Clay	Gerard Granollers	Ivan Gakhov Sergio Martos Gornés	6–2, 6–2
Loss	12–9	May 2017	Spain F13, Valldoreix	Futures	Clay	David Vega Hernández	Igor Marcondes Rafael Matos	7–6(4), 6–7(6), [10–12]
Win	13–9	Jul 2017	Spain F21, Gandia	Futures	Clay	Marc Giner	Ivan Gakhov Sergio Martos Gornés	7–6(4), 6–3
Win	14–9	Jul 2017	Spain F22, Dénia	Futures	Clay	Ivan Gakhov	Juan Lizariturry Jaume Pla Malfeito	7–5, 6–7(7), [11–9]
Win	15–9	Sep 2017	Spain F29, Seville	Futures	Clay	David Vega Hernández	Marc Giner Jaume Pla Malfeito	3–6, 6–4, [10–5]
Win	16–9	Sep 2017	Spain F30, Madrid	Futures	Clay (i)	Miguel Semmler	Christopher Heyman Yannick Vandenbulcke	6–4, 6–4
Loss	16–10	Nov 2017	Pune, India	Challenger	Hard	Adrián Menéndez Maceiras	Tomislav Brkić Ante Pavić	1–6, 6–7(5)
Loss	16–11	Jan 2018	Bangkok, Thailand	Challenger	Hard	Enrique López Pérez	James Cerretani Joe Salisbury	7–6(5), 3–6, [8–10]
Win	17–11	Feb 2018	Egypt F3, Sharm El Sheikh	Futures	Hard	Omar Salman	Maxence Brovillé Johan Sébastien Tatlot	6–4, 6–7(5), [10–5]
Win	18–11	Mar 2018	Spain F6, Xàbia	Futures	Clay	Germain Gigounon	Kimmer Coppejans Ivan Gakhov	7–6(4), 7–6(1)
Loss	18–12	Jun 2018	L’Aquila, Italy	Challenger	Clay	Mark Vervoort	Filippo Baldi Andrea Pellegrino	6–4, 3–6, [5–10]
Win	19–12	Sep 2018	Seville, Spain	Challenger	Clay	Gerard Granollers	Daniel Gimeno Traver Ricardo Ojeda Lara	6–0, 6–2
Loss	19–13	Sep 2018	Tiburon, USA	Challenger	Hard	Gerard Granollers	Hans Hach Luke Saville	3–6, 2–6
Loss	19–14	Apr 2019	Alicante, Spain	Challenger	Clay	Gerard Granollers	Thomaz Bellucci Guillermo Durán	6–2, 5–7, [5–10]
Loss	19–15	Jun 2019	Poznań, Poland	Challenger	Clay	Mark Vervoort	Andrea Vavassori David Vega Hernández	4–6, 7–6(4), [6–10]
Win	20–15	Sep 2019	Seville, Spain	Challenger	Clay	Gerard Granollers	Kimmer Coppejans Sergio Martos Gornés	7–5, 6–4
Loss	20–16	Sep 2019	Florence, Italy	Challenger	Clay	Gerard Granollers	Luca Margaroli Adil Shamasdin	5–7, 7–6(6), [12–14]
Win	21-16	Nov 2020	Marbella, Spain	Challenger	Clay	Gerard Granollers	Luis David Martínez Fernando Romboli	6–3, 6–4
Win	22-16	Sep 2023	Seville, Spain	Challenger	Clay	Alberto Barroso Campos	Sriram Balaji Fernando Romboli	3–6, 7–6(5), [11–9]