2011: Maiden singles Challenger

He claimed his first Challenger singles title by winning the 2011 Challenger ATP de Salinas Diario Expreso in Salinas, Ecuador where he won against his compatriot Horacio Zeballos 7–5, 7–6⁽⁴⁾.^[4]

2021–2022: New partnership with S. González, five more titles, Top 35

In 2021, Molteni won his seventh and eighth ATP 250 doubles titles at the 2021 Astana Open^[5] and the 2021 Stockholm Open partnering Santiago González.^[6]

In 2022, he won two more clay titles with Santiago González at the 2022 Córdoba Open^[7] and 2022 Argentina Open.^[8]

He reached a career-high of No. 31 on 21 March 2022 following the Indian Wells Masters where he lost with Diego Schwartzman in the second round to second seeded pair of Rajeev Ram and Joe Salisbury.

2023: Maiden Masters 1000 & ATP 500 & tenth clay titles, Two Major quarterfinals with M. González, World No. 7

Molteni won another clay title at the 2023 Córdoba Open with compatriot Máximo González. It was his third at this tournament. He won two more ATP 500 titles with Máximo González at the 2023 Rio Open, his first at this level, and at the 2023 Barcelona Open Banc Sabadell. As a result, the pair climbed four spots to fourth in the ATP Live doubles team rankings.^[9] Molteni also reached a new career-high ranking in the Top 30 of No. 28 on 24 April 2023.

After winning the biggest title of his career, the Masters 1000 2023 Western & Southern Open with Gonzalez, he reached World No. 7 in the rankings on 21 August 2023.^[10] Next he reached his second Major quarterfinal of the season and in his career at the 2023 US Open (tennis) with Gonzalez.

Masters 1000 finals

Doubles: 1 (1 title)

Outcome	Year	Championship	Surface	Partner	Opponents	Score
Win	2023	Cincinnati Masters	Hard	Máximo González	Jamie Murray Michael Venus	3–6, 6–1, [11–9]

Doubles: 23 (16 titles, 7 runner-ups)

Result	W–L	Date	Tournament	Tier	Surface	Partner	Opponents	Score
Loss	0–1	May 2016	Istanbul Open, Turkey	250 Series	Clay	Diego Schwartzman	Flavio Cipolla Dudi Sela	3–6, 7–5, [7–10]
Win	1–1	Aug 2016	Atlanta Open, United States	250 Series	Hard	Horacio Zeballos	Johan Brunström Andreas Siljeström	7–6(7–2), 6–4
Win	2–1	May 2017	Lyon Open, France	250 Series	Clay	Adil Shamasdin	Marcus Daniell Marcelo Demoliner	6–3, 3–6, [10–5]
Win	3–1	Jul 2017	Croatia Open, Croatia	250 Series	Clay	Guillermo Durán	Marin Draganja Tomislav Draganja	6–3, 6–7(4–7), [10–6]
Win	4–1	Feb 2018	Argentina Open, Argentina	250 Series	Clay	Horacio Zeballos	Juan Sebastián Cabal Robert Farah	6–3, 5–7, [10–3]
Loss	4–2	Apr 2018	Hungarian Open, Hungary	250 Series	Clay	Matwé Middelkoop	Dominic Inglot Franko Škugor	7–6(10–8), 1–6, [8–10]
Win	5–2	Aug 2018	Austrian Open Kitzbühel, Austria	250 Series	Clay	Roman Jebavý	Daniele Bracciali Federico Delbonis	6–2, 6–4
Win	6–2	Feb 2019	Córdoba Open, Argentina	250 Series	Clay	Roman Jebavý	Máximo González Horacio Zeballos	6–4, 7–6(7–4)
Loss	6–3	Oct 2019	Kremlin Cup, Russia	250 Series	Hard (i)	Simone Bolelli	Marcelo Demoliner Matwé Middelkoop	1–6, 2–6
Loss	6–4	Feb 2020	Córdoba Open, Argentina	250 Series	Clay	Leonardo Mayer	Marcelo Demoliner Matwé Middelkoop	3–6, 6–7(4–7)
Loss	6–5	Apr 2021	Sardegna Open, Italy	250 Series	Clay	Simone Bolelli	Lorenzo Sonego Andrea Vavassori	3–6, 4–6
Win	7–5	Sep 2021	Astana Open, Kazakhstan	250 Series	Hard (i)	Santiago González	Jonathan Erlich Andrei Vasilevski	6–1, 6–2
Win	8–5	Nov 2021	Stockholm Open, Sweden	250 Series	Hard (i)	Santiago González	Aisam-ul-Haq Qureshi Jean-Julien Rojer	6–2, 6–2
Win	9–5	Feb 2022	Córdoba Open, Argentina (2)	250 Series	Clay	Santiago González	Andrej Martin Tristan-Samuel Weissborn	7–5, 6–3
Win	10–5	Feb 2022	Argentina Open, Argentina (2)	250 Series	Clay	Santiago González	Fabio Fognini Horacio Zeballos	6–1, 6–1
Loss	10–6	Oct 2022	Tel Aviv Open, Israel	250 Series	Hard (i)	Santiago González	Rohan Bopanna Matwé Middelkoop	2–6, 4–6
Win	11–6	Oct 2022	Gijón Open, Spain	250 Series	Hard (i)	Máximo González	Nathaniel Lammons Jackson Withrow	6–7(6–8), 7–6(7–4), [10–5]
Loss	11–7	Oct 2022	Vienna Open, Austria	500 Series	Hard (i)	Santiago González	Alexander Erler Lucas Miedler	3–6, 6–7(1–7)
Win	12–7	Feb 2023	Córdoba Open, Argentina (3)	250 Series	Clay	Máximo González	Sadio Doumbia Fabien Reboul	6–4, 6–4
Win	13–7	Feb 2023	Rio Open, Brazil	500 Series	Clay	Máximo González	Juan Sebastián Cabal Marcelo Melo	6–1, 7–6(7–3)
Win	14–7	Apr 2023	Barcelona Open, Spain	500 Series	Clay	Máximo González	Wesley Koolhof Neal Skupski	6–3, 6–7(8–10), [10–4]
Win	15–7	Jul 2023	Washington Open, United States	500 Series	Hard	Máximo González	Mackenzie McDonald Ben Shelton	6–7(4–7), 6–2, [10–6]
Win	16–7	Aug 2023	Cincinnati Masters, United States	Masters 1000	Hard	Máximo González	Jamie Murray Michael Venus	3–6, 6–1, [11–9]

Singles (16)

No.	Date	Tournament	Surface	Opponent in the final	Score in the final
1.	May 5, 2008	Argentina F1 (Reconquista, Santa Fe)	Clay	Federico Cavallero	7–6(7–3), 7–6(7–3)
2.	June 15, 2009	Argentina F9	Clay	Juan-Pablo Villar	5–7, 6–4, 6–4
3.	July 27, 2009	Venezuela F6	Hard	Gonzalo Tur	6–4, 6–2
4.	May 10, 2010	Argentina F6	Clay	Antonio Pastorino	6–4, 6–3
5.	May 31, 2010	Argentina F7 (Neuquén)	Clay	Diego Schwartzman	6–4, 6–2
6.	June 21, 2010	Argentina F10	Clay	Antonio Pastorino	6–3, 6–0
7.	July 19, 2010	Argentina F14	Clay	Facundo Argüello	3–6, 7–6(7–4), 6–1
8.	November 1, 2010	Argentina F22	Clay	Marco Trungelliti	6–2, 6–0
9.	February 28, 2011	Salinas, Ecuador	Hard	Horacio Zeballos	7–5, 7–6(7–4)

Doubles (55)

No.	Date	Tournament	Surface	Partner	Opponents in the final	Score in final
1.	July 31, 2006	Argentina F10	Clay	Nicolás Jara-Lozano	Rodolfo Daruich Demian Gschwend	6–3, 7–5
2.	August 13, 2007	Argentina F12	Clay	Demian Gschwend	Guillermo Bujniewicz Damián Listingart	6–4, 6–4
3.	September 8, 2008	Bolivia F1	Clay	Guillermo Carry	Miguel Cicenia Mauricio Doria-Medina	6–4, 6–4
4.	September 15, 2008	Bolivia F2	Clay	Guillermo Carry	Facundo Bagnis Agustín Picco	6–2, 6–4
5.	September 22, 2008	Bolivia F3	Clay	Guillermo Carry	Alessandro Liberatore Juan-Pablo Villar	6–1, 6–0
6.	October 27, 2008	Argentina F14	Clay	Guido Pella	Alejandro Kon Gonzalo Tur	4–6, 6–3, [10–8]
7.	November 10, 2008	Argentina F16	Clay	Guido Pella	Guillermo Bujniewicz Nicolás Jara-Lozano	6–3, 5–7, [14–12]
8.	December 1, 2008	Argentina F17	Clay	Guido Pella	Diego Cristin Gastón-Arturo Grimolizzi	6–7(6–8), 7–6(13–11), [10–6]
9.	April 27, 2009	Argentina F3	Clay	Guido Pella	Guillermo Durán German Gaich	6–2, 6–4
10.	May 18, 2009	Argentina F6	Clay	Diego Cristin	Federico Cavallero Agustín Picco	2–6, 7–6(9–7), [10–5]
11.	June 22, 2009	Argentina F10	Clay	Nicolás Jara-Lozano	Alejandro Kon Juan-Manuel Valverde	7–6(7–5), 6–2
12.	August 10, 2009	Colombia F3	Clay	Gonzalo Tur	Daniel Garza Michael Quintero	6–4, 7–6(8–6)
13.	September 7, 2009	Argentina F14	Clay	Gonzalo Tur	Guido Andreozzi Kevin Konfederak	4–6, 6–2, [12–10]
14.	November 23, 2009	Argentina F25	Clay	Guido Pella	Alejandro Fabbri Jonathan Gonzalia	6–1, 6–3
15.	January 25, 2010	Argentina F1	Clay	Diego Cristin	Alejandro Fabbri Jonathan Gonzalia	7–5, 6–7(6–8), [10–6]
16.	February 8, 2010	Argentina F3	Clay	Diego Cristin	Alejandro Fabbri Diego Schwartzman	6–3, 6–4
17.	May 31, 2010	Argentina F7	Clay	Nicolás Jara-Lozano	Rodrigo Gómez Saigos Gustavo Sterin	6–3, 6–2
18.	June 14, 2010	Argentina F9	Clay	Diego Schwartzman	Lionel Noviski Antonio Pastorino	6–2, 6–3
19.	June 28, 2010	Argentina F11	Clay	Diego Schwartzman	Gastón Giussani Joaquín-Jesús Monteferrario	3–6, 6–2, [10–4]
20.	July 19, 2010	Argentina F14	Clay	Diego Schwartzman	Facundo Argüello Federico Coria	6–3, 6–4
21.	August 6, 2011	Trani	Clay	Jorge Aguilar	Giulio Di Meo Stefano Ianni	6–4, 6–4
22.	April 22, 2012	Santos	Clay	Marco Trungelliti	Rogério Dutra da Silva Júlio Silva	6–4, 6–3
23.	November 17, 2013	Lima	Clay	Fernando Romboli	Marcelo Demoliner Sergio Galdós	6–4, 6–4
24.	April 27, 2014	Santos	Clay	Máximo González	Guillermo Durán Renzo Olivo	7–5, 6–4
25.	April 17, 2021	Belgrade	Clay	Guillermo Durán	Tomislav Brkić Nikola Ćaćić	6–4, 6–4
26.	September 18, 2021	Szczecin	Clay	Santiago González	André Göransson Nathaniel Lammons	2–6, 6–2, [15–13]