Tristan-Samuel Weissborn (born 24 October 1991) is an Austrian professional tennis player who specializes in doubles.

Weissborn has been ranked by the Association of Tennis Professionals (ATP) as high as world No. 50 in doubles, which he achieved in July 2023. He also reached his career-high singles ranking of world No. 503, attained in July 2013. Since turning professional, Weissborn has won 20 doubles titles on the ATP Challenger Tour as well as one singles and 23 doubles titles on the ITF Men's World Tennis Tour.

Weissborn won his first ATP Challenger title at the 2015 Sparkassen ATP Challenger, partnering Maximilian Neuchrist.

Weissborn made his ATP World Tour doubles debut at the 2016 Swiss Open Gstaad, where he reached with partner Sander Arends the semifinals.

He reached his maiden ATP doubles final at the 2022 Córdoba Open with Andrej Martin.

On his debut at an ATP Masters 1000 tournament, he reached his first semifinal at the 2023 Monte-Carlo Masters with partner Romain Arneodo after upsetting the second-seeded defending champions Rajeev Ram and Joe Salisbury^[1] as well as sixth-seeded Lloyd Glasspool and Harri Heliövaara.^[2] They reached their first Masters final defeating German duo Kevin Krawietz and Tim Pütz. As a result he moved into the top 60 in the doubles rankings at world No. 59 on 24 April 2023.

Outcome	Year	Tournament	Surface	Partner	Opponents	Score
Loss	2023	Monte-Carlo Masters	Clay	Romain Arneodo	Ivan Dodig Austin Krajicek	0–6, 6–4, [12–14]

Result	W–L	Date	Tournament	Tier	Surface	Partner	Opponents	Score
Loss	0–1	Feb 2022	Córdoba Open, Argentina	250 Series	Clay	Andrej Martin	Santiago González Andrés Molteni	5–7, 3–6
Loss	0–2	Apr 2023	Monte-Carlo Masters, Monaco	Masters 1000	Clay	Romain Arneodo	Ivan Dodig Austin Krajicek	0–6, 6–4, [12–14]
Loss	0–3	Feb 2024	Open Sud de France, France	250 Series	Hard (i)	Albano Olivetti	Sadio Doumbia Fabien Reboul	7–6(7–5), 4–6, [6–10]

Result	W–L	Date	Tournament	Tier	Surface	Opponent	Score
Loss	0–1	Jul 2012	Austria F2, Kramsach	Futures	Clay	Nicolas Reissig	3–6, 0–6
Win	1–1	May 2013	Egypt F8, Sharm El Sheikh	Futures	Clay	Karim Hossam	7–6(7–5), 6–4

Result	W–L	Date	Tournament	Tier	Surface	Partner	Opponents	Score
Win	1–0	Dec 2009	Dominican Republic F3, Santo Domingo	Futures	Hard	Maximilian Neuchrist	Luis David Martínez Nikolaus Moser	0–6, 7–6(7–4), [10–8]
Loss	1–1	Jul 2010	Austria F2, Kramsach	Futures	Clay	Maximilian Neuchrist	Petr Kovačka Marek Michalička	1–6, 3–6
Win	2–1	Aug 2010	Austria F3, Bad Waltersdorf	Futures	Clay	Nicolas Reissig	Michal Konečný Radim Urbánek	6–2, 6–3
Loss	2–2	Sep 2010	Morocco F6, Casablanca	Futures	Clay	Nicolas Reissig	Florian Reynet Maxime Teixeira	6–1, 5–7, [6–10]
Win	3–2	Jul 2011	Austria F2, Kramsach	Futures	Clay	Maximilian Neuchrist	Roman Jebavý Roman Vögeli	6–3, 6–3
Win	4–2	Aug 2011	Austria F5, Innsbruck	Futures	Clay	Mate Pavić	Paris Gemouchidis Michal Konečný	7–6(7–3), 6–4
Win	5–2	Sep 2011	Austria F8, St. Pölten	Futures	Clay	Maximilian Neuchrist	Roman Jebavý Michal Pažický	7–5, 5–7, [11–9]
Win	6–2	Feb 2012	Spain F1, Mallorca	Futures	Clay	Kevin Krawietz	Agustín Boje-Ordóñez Pablo Martín-Adalia	6–2, 6–4
Win	7–2	Apr 2012	Croatia F6, Vrsar	Futures	Clay	Lukas Jastraunig	Krešimir Ritz Joško Topić	6–4, 4–6, [10–8]
Win	8–2	Jun 2012	Slovenia F1, Bled	Futures	Clay	Mislav Hižak	Aljaž Bedene Grega Žemlja	w/o
Loss	8–3	Aug 2012	Austria F6, Innsbruck	Futures	Clay	Lukas Jastraunig	Maximilian Neuchrist Mate Pavić	4–6, 3–6
Win	9–3	Aug 2012	Austria F7, Pörtschach	Futures	Clay	Lukas Jastraunig	Maximilian Neuchrist Mate Pavić	7–6(7–5), 6–3
Win	10–3	Sep 2012	Austria F8, St. Pölten	Futures	Clay	Lukas Jastraunig	Radoslav Novodomec Michal Pažický	6–2, 6–2
Loss	10–4	Sep 2012	Austria F9, Vogau	Futures	Clay	Lukas Jastraunig	Ruben Gonzales Blaž Rola	2–6, 2–6
Loss	10–5	Mar 2013	Croatia F5, Rovinj	Futures	Clay	Nikolaus Moser	Tomislav Brkić Steven Diez	2–6, 2–6
Win	11–5	Apr 2013	Egypt F3, Sharm El Sheikh	Futures	Clay	Gibril Diarra	Vladimir Ivanov Ivan Nedelko	7–6(9–7), 3–6, [13–11]
Win	12–5	Apr 2013	Egypt F4, Sharm El Sheikh	Futures	Clay	Thomas Statzberger	Lukas Jastraunig David Pamminger	4–6, 6–4, [10–6]
Win	13–5	Jul 2013	Austria F2, Seefeld	Futures	Clay	Lukas Jastraunig	Michal Franek Jan Kunčík	7–6(7–5), 6–3
Loss	13–6	Jul 2013	Austria F3, Telfs	Futures	Clay	Lukas Jastraunig	Marc Rath Bastian Trinker	5–7, 6–7(9–11)
Win	14–6	Jul 2013	Austria F4, Kramsach	Futures	Clay	Lukas Jastraunig	Or Ram-Harel Igor Smilansky	2–6, 6–4, [10–5]
Loss	14–7	Aug 2013	Austria F8, Pörtschach	Futures	Clay	Lukas Jastraunig	Jaroslav Pospíšil Sebastian Wagner	2–6, 6–7(4–7)
Loss	14–8	Oct 2013	Kuwait F3, Mishref	Futures	Hard	Thomas Statzberger	Lewis Burton Marcus Willis	2–6, 2–6
Loss	14–9	Jun 2014	Hungary F3, Siófok	Futures	Clay	Viktor Filipenkó	Cristóbal Saavedra Corvalán Ricardo Urzúa Rivera	1–6, 1–6
Loss	14–10	Aug 2014	Austria F8, Vogau	Futures	Clay	Dmitry Popko	Pascal Brunner Thomas Statzberger	6–2, 1–6, [10–12]
Win	15–10	Aug 2014	Austria F9, Pörtschach	Futures	Clay	Sebastian Bader	Gonçalo Oliveira Daniel Uhlig	6–4, 7–6(7–3)
Loss	15–11	Sep 2014	Austria F10, St. Pölten	Futures	Clay	Sebastian Bader	Filip Doležel Petr Michnev	7–6(7–4), 4–6, [5–10]
Loss	15–12	Sep 2014	Croatia F19, Bol	Futures	Clay	Kirill Dmitriev	Libor Salaba Jan Šátral	4–6, 1–6
Win	16–12	Oct 2014	Turkey F37, Antalya	Futures	Hard	Janez Semrajc	Kirill Dmitriev Dennis Novak	6–3, 5–7, [10–2]
Loss	16–13	Nov 2014	Turkey F38, Antalya	Futures	Hard	Janez Semrajc	Adrian Obert Paul Woerner	3–6, 6–1, [8–10]
Loss	16–14	Nov 2014	Turkey F40, Antalya	Futures	Hard	Janez Semrajc	Kevin Krawietz Maximilian Marterer	3–6, 2–6
Win	17–14	Nov 2014	Turkey F41, Antalya	Futures	Hard	Janez Semrajc	Matthias Wunner Lennart Zynga	6–3, 6–3
Win	18–14	Nov 2014	Turkey F42, Antalya	Futures	Hard	Lucas Miedler	Antoine Bellier Adrian Bodmer	7–5, 6–1
Loss	18–15	Feb 2015	Turkey F6, Antalya	Futures	Hard	Gleb Sakharov	Ruan Roelofse Tucker Vorster	3–6, 6–2, [7–10]
Win	19–15	Feb 2015	Turkey F7, Antalya	Futures	Hard	Marat Deviatiarov	Ruan Roelofse Tucker Vorster	7–6(7–5), 6–2
Loss	19–16	Mar 2015	Turkey F8, Antalya	Futures	Hard	Marat Deviatiarov	Ruan Roelofse Tucker Vorster	7–6(7–5), 6–7(4–7), [10–12]
Loss	19–17	Apr 2015	France F8, Angers	Futures	Clay (i)	Sebastian Bader	Jonathan Eysseric Tom Jomby	3–6, 4–6
Loss	19–18	May 2015	Romania F1, Galați	Futures	Clay	Luca Margaroli	Alexandru-Daniel Carpen Luca George Tatomir	5–7, 3–6
Win	20–18	Jul 2015	Italy F17, Sassuolo	Futures	Clay	Mohamed Safwat	Alessandro Giannessi Matteo Volante	4–6, 7–5, [10–8]
Win	21–18	Aug 2015	Italy F22, Appiano	Futures	Clay	Maximilian Neuchrist	Wilson Leite Bruno Sant'Anna	7–5, 4–6, [10–3]
Win	22–18	Aug 2015	Italy F23, Este	Futures	Clay	Maximilian Neuchrist	Rafael Matos Marcelo Zormann	2–6, 6–3, [10–8]
Win	23–18	Sep 2015	Austria F10, St. Pölten	Futures	Clay	Lucas Miedler	Pascal Brunner Dennis Novak	6–3, 6–3
Win	24–18	Nov 2015	Ortisei, Italy	Challenger	Hard (i)	Maximilian Neuchrist	Nikola Mektić Antonio Šančić	7–6(9–7), 6–3
Win	25–18	May 2016	Ostrava, Czech Republic	Challenger	Clay	Sander Arends	Lukáš Dlouhý Hans Podlipnik Castillo	7–6(10–8), 6–7(4–7), [10–5]
Loss	25–19	May 2016	Rome, Italy	Challenger	Clay	Sander Arends	Bai Yan Li Zhe	3–6, 6–3, [9–11]
Win	26–19	May 2016	Heilbronn, Germany	Challenger	Clay	Sander Arends	Nikola Mektić Antonio Šančić	6–3, 6–4
Loss	26–20	Jun 2016	Fürth, Germany	Challenger	Clay	Andrej Martin	Facundo Argüello Roberto Maytín	3–6, 4–6
Win	27–20	Feb 2017	Budapest, Hungary	Challenger	Hard (i)	Dino Marcan	Blaž Kavčič Franko Škugor	6–3, 3–6, [16–14]
Loss	27–21	Feb 2017	Cherbourg, France	Challenger	Hard (i)	Dino Marcan	Roman Jebavý Igor Zelenay	6–7(4–7), 7–6(7–4), [6–10]
Loss	27–22	Feb 2017	Bergamo, Italy	Challenger	Hard (i)	Dino Marcan	Julian Knowle Adil Shamasdin	3–6, 3–6
Win	28–22	Apr 2017	Anning, China	Challenger	Clay	Dino Marcan	Steven de Waard Blaž Kavčič	5–7, 6–3, [10–7]
Loss	28–23	Jun 2017	Vicenza, Italy	Challenger	Clay	Sekou Bangoura	Gero Kretschmer Alexander Satschko	4–6, 6–7(4–7)
Loss	28–24	Jun 2017	Poprad-Tatry, Slovakia	Challenger	Clay	Luca Margaroli	Mateusz Kowalczyk Andreas Mies	3–6, 6–7(3–7)
Win	29–24	Jul 2017	Prague, Czech Republic	Challenger	Clay	Jan Šátral	Gero Kretschmer Andreas Mies	3–6, 7–5, [10–3]
Loss	29–25	Nov 2017	Brescia, Italy	Challenger	Hard (i)	Luca Margaroli	Sander Arends Sander Gillé	2–6, 3–6
Win	30–25	Jan 2018	Koblenz, Germany	Challenger	Hard (i)	Romain Arneodo	Sander Arends Antonio Šančić	6–7(4–7), 7–5, [10–6]
Win	31–25	Feb 2018	Cherbourg, France	Challenger	Hard (i)	Romain Arneodo	Antonio Šančić Ken Skupski	6–3, 1–6, [10–4]
Win	32–25	Mar 2018	Saint Brieuc, France	Challenger	Hard (i)	Sander Arends	Luke Bambridge Joe Salisbury	4–6, 6–1, [10–7]
Loss	32–26	Sep 2018	Orléans, France	Challenger	Hard (i)	Yannick Maden	Luke Bambridge Jonny O'Mara	2–6, 4–6
Win	33–26	Jan 2019	Rennes, France	Challenger	Hard (i)	Sander Arends	David Pel Antonio Šančić	6–4, 6–4
Loss	33–27	Mar 2019	Pau, France	Challenger	Hard (i)	Sander Arends	Scott Clayton Adil Shamasdin	6–7(4–7), 7–5, [8–10]
Loss	33–28	Apr 2019	Taipei, Taiwan	Challenger	Hard (i)	Sander Arends	Sriram Balaji Jonathan Erlich	3–6, 2–6
Win	34–28	Apr 2019	Nanchang, China	Challenger	Clay (i)	Sander Arends	Alex Bolt Akira Santillan	6–2, 6–4
Win	35–28	Jan 2020	Rennes, France	Challenger	Hard (i)	Antonio Sancic	Teymuraz Gabashvili Lukáš Lacko	7–5, 6–7(5–7), [10–7]
Loss	35–29	Jan 2020	Newport Beach, USA	Challenger	Hard	Antonio Sancic	Gonzalo Escobar Ariel Behar	2–6, 4–6
Win	36–29	Oct 2020	Barcelona, Spain	Challenger	Clay	Szymon Walków	Harri Heliövaara Alex Lawson	6–1, 4–6, [10–8]
Loss	36–30	Jun 2021	Milan, Italy	Challenger	Clay	Dustin Brown	Vít Kopřiva Jiří Lehečka	4–6, 0–6
Win	37–30	Oct 2021	Lošinj, Croatia	Challenger	Clay	Andrej Martin	Victor Vlad Cornea Ergi Kırkın	6–1, 7–6(7–5)
Win	38–30	Nov 2021	Ortisei, Italy	Challenger	Hard (i)	Antonio Šančić	Alexander Erler Lucas Miedler	7–6(10–8), 4–6, [10–8]
Win	39–30	Nov 2021	Pau, France	Challenger	Hard (i)	Romain Arneodo	Aisam-ul-Haq Qureshi David Vega Hernández	6–4, 6–2
Win	40–30	Dec 2021	Forli, Italy	Challenger	Hard (i)	Antonio Šančić	Lukáš Rosol Vitaliy Sachko	7–6(7–4), 4–6, [10–7]
Loss	40–31	Jan 2022	Santa Cruz de la Sierra, Bolivia	Challenger	Clay	Andrej Martin	Diego Hidalgo Cristian Rodríguez	6–4, 3–6, [8–10]
Loss	40–32	Oct 2022	Saint-Tropez, France	Challenger	Hard	Romain Arneodo	Dan Added Albano Olivetti	3–6, 6–3, [10–12]
Win	41–32	Oct 2022	Vilnius, Lithuania	Challenger	Hard (i)	Romain Arneodo	Dan Added Théo Arribagé	6–4, 5–7, [10–5]
Win	42–32	Jan 2023	Ottignies-Louvain-la-Neuve, Belgium	Challenger	Hard (i)	Romain Arneodo	Roman Jebavý Adam Pavlásek	6–4, 6–3
Win	43–32	May 2023	Upper Austria Open, Austria	Challenger	Clay	Romain Arneodo	Constantin Frantzen Hendrik Jebens	6–4, 6–2

• Sam Weissborn at the Association of Tennis Professionals
• Sam Weissborn at the International Tennis Federation