Guillermo Durán (Spanish pronunciation: [ɡiˈʝeɾmo ðuˈɾan];^[a] born 6 June 1988) is an Argentine tennis player, who specializes in doubles. He competes mostly on the ATP Challenger Tour. His highest ATP doubles ranking of world No. 48 was achieved on 23 May 2016 and his highest ATP singles ranking of No. 385 was reached on 2 April 2012.

Result	W–L	Date	Tournament	Tier	Surface	Partner	Opponents	Score
Win	1–0	Feb 2016	Ecuador Open, Ecuador	250 Series	Clay	Pablo Carreño Busta	Thomaz Bellucci Marcelo Demoliner	7–5, 6–4
Win	2–0	Apr 2016	Grand Prix Hassan II, Morocco	250 Series	Clay	Máximo González	Marin Draganja Aisam-ul-Haq Qureshi	6–2, 3–6, [10–6]
Win	3–0	Jul 2017	Croatia Open, Croatia	250 Series	Clay	Andrés Molteni	Marin Draganja Tomislav Draganja	6–3, 6–7(4–7), [10–6]
Win	4–0	Aug 2017	Austrian Open, Austria	250 Series	Clay	Pablo Cuevas	Hans Podlipnik-Castillo Andrei Vasilevski	6–4, 4–6, [12–10]
Loss	4–1	Feb 2020	Argentina Open, Argentina	250 Series	Clay	Juan Ignacio Londero	Marcel Granollers Horacio Zeballos	4–6, 7–5, [16–18]

Result	W–L	Date	Tournament	Tier	Surface	Opponent	Score
Loss	0–1	May 2010	Argentina F4, Buenos Aires	Futures	Clay	Lionel Noviski	4–6, 4–6
Loss	0–2	Jun 2010	Argentina F8, Córdoba	Futures	Clay	Marco Trungelliti	3–6, 6–4, 2–6
Loss	0–3	Aug 2010	Argentina F16, Santiago del Estero	Futures	Clay	Pablo Galdón	0–6, 4–6
Loss	0–4	Jun 2011	Argentina F6, Posadas	Futures	Clay	Kevin Konfederak	4–6, 6–2, 5–7
Loss	0–5	Jul 2011	Argentina F9, Resistencia	Futures	Clay	Facundo Argüello	4–6, 2–6
Loss	0–6	Sep 2011	Argentina F17, La Rioja	Futures	Clay	Gastón-Arturo Grimolizzi	3–6, 6–7(7–9)
Loss	0–7	Dec 2011	Brazil F42, Porto Alegre	Futures	Clay	Martín Alund	6–3, 3–6, 4–6
Loss	0–8	Nov 2012	Argentina F26, Rosario	Futures	Clay	Renzo Olivo	6–3, 2–6, 4–6
Win	1–8	Dec 2012	Argentina F28, Río Cuarto	Futures	Clay	Gabriel Alejandro Hidalgo	6–2, 7–5
Loss	1–9	Dec 2014	Argentina F19, Mendoza	Futures	Clay	Grzegorz Panfil	5–7, 4–6

Result	W–L	Date	Tournament	Tier	Surface	Partner	Opponents	Score
Loss	0–1	Jun 2008	Brazil F9, Fortaleza	Futures	Hard	Cristhian Ignacio Benedetti	Diogo Cruz Eric Gomes	2–6, 2–6
Loss	0–2	Jul 2008	Peru F1, Arequipa	Futures	Clay	Cristhian Ignacio Benedetti	Miguel Cicenia Benjamin Dracos	4–6, 5–7
Loss	0–3	May 2009	Argentina F3, Arroyito	Futures	Clay	Germán Gaich	Andrés Molteni Guido Pella	2–6, 4–6
Loss	0–4	Jul 2009	Venezuela F4, Puerto Ordaz	Futures	Hard	Kevin Konfederak	Luis David Martínez Nikolaus Moser	1–6, 1–6
Loss	0–5	Oct 2009	Argentina F18, La Rioja	Futures	Clay	Valentin Florez	Diego Cristin Alejandro Fabbri	6–7(4–7), 6–7(9–11)
Win	1–5	Jun 2010	Argentina F10, Posadas	Futures	Clay	Agustín Picco	Joaquín-Jesús Monteferrario Antonio Pastorino	4–6, 7–6(7–1), [10–5]
Win	2–5	Aug 2010	Argentina F15, Buenos Aires	Futures	Clay	Guillermo Bujniewicz	Franco Agamenone Facundo Argüello	6–4, 6–2
Win	3–5	Aug 2010	Argentina F16, Santiago del Estero	Futures	Clay	Guillermo Bujniewicz	Diego Cristin Martín Cuevas	4–6, 6–2, [10–4]
Loss	3–6	Dec 2010	Chile F7, Talca	Futures	Clay	Kevin Konfederak	Guillermo Hormazábal Hans Podlipnik Castillo	5–7, 7–6(12–10), [5–10]
Loss	3–7	Apr 2011	Argentina F2, Villa María	Futures	Clay	Alejandro Kon	Diego Álvarez Cristóbal Saavedra Corvalán	6–4, 5–7, [7–10]
Win	4–7	Jun 2011	Argentina F6, Posadas	Futures	Clay	Joaquín-Jesús Monteferrario	Federico Coria Renzo Olivo	6–4, 7–6(7–4)
Win	5–7	Jun 2011	Argentina F7, Oberá	Futures	Clay	Patricio Heras	Juan Ignacio Londero Nicolás Pastor	6–1, 7–6(7–4)
Loss	5–8	Sep 2011	Argentina F17, La Rioja	Futures	Clay	Juan-Manuel Romanazzi	Patricio Heras Gustavo Sterin	6–7(5–7), 3–6
Win	6–8	Dec 2011	Brazil F42, Porto Alegre	Futures	Clay	Renzo Olivo	Martín Alund Andrés Molteni	6–4, 6–2
Win	7–8	Mar 2012	Argentina F3, Mendoza	Futures	Clay	Diego Schwartzman	Martín Alund Francisco Bahamonde	6–2, 7–6(7–2)
Win	8–8	Jul 2012	Argentina F18, Bell Ville	Futures	Clay	Renzo Olivo	Martín Cuevas Juan Ignacio Londero	6–4, 7–5
Loss	8–9	Oct 2012	Villa Allende, Argentina	Challenger	Clay	Ariel Behar	Facundo Bagnis Diego Junqueira	1–6, 2–6
Win	9–9	May 2013	Argentina F7, Bell Ville	Futures	Clay	Andrea Collarini	Duilio Beretta Sergio Galdós	6–3, 6–4
Loss	9–10	Jul 2013	Orbetello, Italy	Challenger	Clay	Renzo Olivo	Marco Crugnola Simone Vagnozzi	6–7(3–7), 7–6(7–5), [6–10]
Win	10–10	Aug 2013	Argentina F16, Santiago del Estero	Futures	Clay	Andrés Molteni	Martín Cuevas Sergio Galdós	6–7(4–7), 6–3, [13–11]
Win	11–10	Sep 2013	Porto Alegre, Brazil	Challenger	Clay	Máximo González	Víctor Estrella Burgos João Souza	3–6, 6–1, [10–5]
Win	12–10	Oct 2013	San Juan, Argentina	Challenger	Clay	Máximo González	Martín Alund Facundo Bagnis	6–3, 6–0
Loss	12–11	Dec 2013	Brazil F20, Santa Maria	Futures	Clay	Christian Lindell	José Pereira Alexandre Tsuchiya	5–7, 3–6
Loss	12–12	Mar 2014	Panama City, Panama	Challenger	Clay	Martín Alund	František Čermák Mikhail Elgin	6–4, 3–6, [8–10]
Loss	12–13	Apr 2014	Santos, Brazil	Challenger	Clay	Renzo Olivo	Máximo González Andrés Molteni	5–7, 4–6
Loss	12–14	Jun 2014	Blois, France	Challenger	Clay	Máximo González	Tristan Lamasine Laurent Lokoli	5–7, 0–6
Win	13–14	Jun 2014	Milan, Italy	Challenger	Clay	Máximo González	James Cerretani Frank Moser	6–3, 6–3
Loss	13–15	Jun 2014	Padova, Italy	Challenger	Clay	Máximo González	Roberto Maytín Andrés Molteni	2–6, 6–3, [8–10]
Win	14–15	Jul 2014	Todi, Italy	Challenger	Clay	Máximo González	Riccardo Ghedin Claudio Grassi	6–1, 3–6, [10–7]
Win	15–15	Sep 2014	Porto Alegre, Brazil	Challenger	Clay	Guido Andreozzi	Facundo Bagnis Diego Schwartzman	6–3, 6–3
Win	16–15	Oct 2014	Cali, Colombia	Challenger	Clay	Guido Andreozzi	Alejandro González César Ramírez	6–3, 6–4
Win	17–15	Dec 2014	Argentina F19, Mendoza	Futures	Clay	Mateo Nicolás Martínez	Patricio Heras Nicolás Kicker	6–3, 6–4
Win	18–15	Feb 2015	Bucaramanga, Colombia	Challenger	Clay	Andrés Molteni	Nicolás Barrientos Eduardo Struvay	7–5, 6–7(8–10), [10–0]
Win	19–15	Apr 2015	San Luis Potosí, Mexico	Challenger	Clay	Horacio Zeballos	Sergio Galdós Guido Pella	7–6(7–4), 6–4
Loss	19–16	Apr 2015	León, Mexico	Challenger	Hard	Horacio Zeballos	Austin Krajicek Rajeev Ram	2–6, 5–7
Win	20–16	Apr 2015	Savannah, USA	Challenger	Clay	Horacio Zeballos	Dennis Novikov Julio Peralta	6–4, 6–3
Win	21–16	Jun 2015	Fürth, Germany	Challenger	Clay	Horacio Zeballos	Íñigo Cervantes Huegun Renzo Olivo	6–1, 6–3
Win	22–16	Jun 2015	Caltanissetta, Italy	Challenger	Clay	Guido Andreozzi	Lee Hsin-han Alessandro Motti	6–3, 6–2
Win	23–16	Sep 2015	Genova, Italy	Challenger	Clay	Horacio Zeballos	Andrea Arnaboldi Alessandro Giannessi	7–5, 6–4
Loss	23–17	Oct 2015	Corrientes, Argentina	Challenger	Clay	Máximo González	Julio Peralta Horacio Zeballos	2–6, 3–6
Win	24–17	Oct 2015	Santiago, Chile	Challenger	Clay	Máximo González	Andrej Martin Hans Podlipnik Castillo	7–6(7–2), 7–5
Win	25–17	Nov 2015	Guayaquil, Ecuador	Challenger	Clay	Andrés Molteni	Gastão Elias Fabrício Neis	6–3, 6–4
Loss	25–18	May 2016	Aix-en-Provence, France	Challenger	Clay	Máximo González	Oliver Marach Philipp Oswald	1–6, 6–4, [7–10]
Loss	25–19	May 2016	Bordeaux, France	Challenger	Clay	Máximo González	Johan Brunström Andreas Siljeström	1–6, 6–3, [4–10]
Loss	25–20	Mar 2017	Buenos Aires, Argentina	Challenger	Hard	Guido Andreozzi	Máximo González Andrés Molteni	1–6, 7–6(8–6), [5–10]
Win	26–20	Jun 2017	Prostějov, Czech Republic	Challenger	Clay	Andrés Molteni	Roman Jebavý Hans Podlipnik Castillo	7–6(7–5), 6–7(5–7), [10–6]
Win	27–20	Oct 2017	Orléans, France	Challenger	Hard (i)	Andrés Molteni	Jonathan Eysseric Tristan Lamasine	6–3, 6–7(4–7), [13–11]
Loss	27–21	Mar 2018	Santiago, Chile	Challenger	Clay	Guido Andreozzi	Romain Arneodo Jonathan Eysseric	6–7(4–7), 6–1, [10–12]
Loss	27–22	May 2018	Bordeaux, France	Challenger	Clay	Máximo González	Bradley Klahn Peter Polansky	3–6, 6–3, [7–10]
Loss	27–23	Sep 2018	Szczecin, Poland	Challenger	Clay	Guido Andreozzi	Karol Drzewiecki Filip Polášek	3–6, 4–6
Win	28–23	Oct 2018	Campinas, Brazil	Challenger	Clay	Hugo Dellien	Franco Agamenone Fernando Romboli	7–5, 6–4
Win	29–23	Oct 2018	Lima, Peru	Challenger	Clay	Guido Andreozzi	Ariel Behar Gonzalo Escobar	2–6, 7–6(7–5), [10–5]
Win	30–23	Nov 2018	Guayaquil, Ecuador	Challenger	Clay	Roberto Quiroz	Thiago Monteiro Fabrício Neis	6–3, 6–2
Win	31–23	Nov 2018	Montevideo, Uruguay	Challenger	Clay	Guido Andreozzi	Facundo Bagnis Andrés Molteni	7–6(7–5), 6–4
Win	32–23	Nov 2018	Buenos Aires, Argentina	Challenger	Clay	Guido Andreozzi	Marcelo Demoliner Andrés Molteni	6–4, 4–6, [10–3]
Win	33–23	Jan 2019	Punta del Este, Uruguay	Challenger	Clay	Guido Andreozzi	Sander Gillé Joran Vliegen	6–2, 6–7(6–8), [10–8]
Win	34–23	Apr 2019	Alicante, Spain	Challenger	Clay	Thomaz Bellucci	Gerard Granollers Pujol Pedro Martínez	2–6, 7–5, [10–5]
Loss	34–24	Apr 2019	Tunis, Tunisia	Challenger	Clay	Facundo Argüello	Ruben Bemelmans Tim Pütz	3–6, 1–6
Loss	34–25	Apr 2019	Francavilla, Italy	Challenger	Clay	David Vega Hernández	Denys Molchanov Igor Zelenay	3–6, 1–6
Loss	34–26	May 2019	Lisbon, Portugal	Challenger	Clay	Guido Andreozzi	Philipp Oswald Filip Polášek	5–7, 2–6
Win	35–26	Jul 2019	Braunschweig, Germany	Challenger	Clay	Simone Bolelli	Antonio Šančić Nathaniel Lammons	6–3, 6–2
Win	36–26	Apr 2021	Belgrade, Serbia	Challenger	Clay	Andrés Molteni	Tomislav Brkić Nikola Ćaćić	6–4, 6–4
Loss	36–27	May 2021	Rome, Italy	Challenger	Clay	Guido Andreozzi	Sadio Doumbia Fabien Reboul	5–7, 3–6
Win	37-27	Jul 2021	Porto, Portugal	Challenger	Hard	Guido Andreozzi	Renzo Olivo Miguel Ángel Reyes-Varela	6–7(5–7), 7–6(7–5), [11–9]
Win	38-27	Apr 2022	Tigre, Argentina	Challenger	Clay	Felipe Meligeni Alves	Luciano Darderi Juan Bautista Torres	3–6, 6–4, [10–3]
Win	39-27	May 2022	Coquimbo, Chile	Challenger	Clay	Nicolás Mejía	Diego Hidalgo Cristian Rodríguez	6–4, 1–6, [10–7]
Win	40-27	June 2022	Corrientes, Argentina	Challenger	Clay	Guido Andreozzi	Nicolás Álvarez Murkel Dellien	7-5, 6-2
Win	41-27	Jul 2022	Todi, Italy	Challenger	Clay	Guido Andreozzi	Romain Arneodo Jonathan Eysseric	6–1, 2–6, [10–6]
Win	42-27	Sep 2022	Buenos Aires, Argentina	Challenger	Clay	Guido Andreozzi	Román Andrés Burruchaga Facundo Díaz Acosta	6–0, 7–5
Loss	42–28	Oct 2022	Campinas, Brazil	Challenger	Clay	Guido Andreozzi	Boris Arias Federico Zeballos	5–7, 2–6
Win	43–28	Oct 2022	Rio de Janeiro, Brazil	Challenger	Clay	Guido Andreozzi	Karol Drzewiecki Jakub Paul	6–3, 6–2
Loss	43–29	Oct 2022	Lima, Peru	Challenger	Clay	Guido Andreozzi	Jesper de Jong Max Houkes	6–7(6–8), 6–3, [10–12]
Win	44–29	Oct 2022	Guayaquil, Ecuador	Challenger	Clay	Guido Andreozzi	Facundo Díaz Acosta Luis David Martínez	6–0, 6–4
Win	45–29	Nov 2022	São Leopoldo, Brazil	Challenger	Clay	Guido Andreozzi	Felipe Meligeni Alves João Lucas Reis da Silva	5–1 ret.
Win	46–29	Nov 2022	Temuco, Chile	Challenger	Hard	Guido Andreozzi	Luis David Martínez Jeevan Nedunchezhiyan	6–4, 6–2
Win	47–29	Jan 2023	Concepción, Chile	Challenger	Clay	Guido Andreozzi	Luciano Darderi Oleg Prihodko	7–6(7–1), 6–7(3–7), [10–7]
Loss	47–30	Apr 2023	Sarasota, United States	Challenger	Clay	Guido Andreozzi	Julian Cash Henry Patten	6–7(4–7), 4–6
Loss	47–31	Apr 2023	Ostrava, Czech Republic	Challenger	Clay	Guido Andreozzi	Robert Galloway Miguel Ángel Reyes-Varela	5–7, 6–7(5–7)
Loss	47–32	Sep 2023	Bogotá, Colombia	Challenger	Clay	Orlando Luz	Renzo Olivo Thiago Agustín Tirante	6–7(6–8), 4–6
Win	48–32	Oct 2023	Campinas, Brazil	Challenger	Clay	Guido Andreozzi	Diego Hidalgo Cristian Rodríguez	7–6(7–4), 6–3
Win	49–32	Nov 2023	Montevideo, Uruguay	Challenger	Clay	Guido Andreozzi	Boris Arias Federico Zeballos	2–6, 7–6(7–2), [10–8]
Loss	49–33	Jan 2024	Punta del Este, Uruguay	Challenger	Clay	Guido Andreozzi	Murkel Dellien Federico Agustin Gomez	3–6, 2–6
Win	50–33	Jan 2024	Piracicaba, Brazil	Challenger	Clay	Guido Andreozzi	Daniel Dutra da Silva Pedro Sakamoto	6–2, 7–6(7–5)
Win	51–33	Jul 2024	Amersfoort, Netherlands	Challenger	Clay	Marcelo Demoliner	Jay Clarke David Stevenson	7–6(7–2), 6–4

• Guillermo Durán at the Association of Tennis Professionals
• Guillermo Durán at the International Tennis Federation