Constantin Frantzen

Country (sports)	Germany
Born	(1998-03-16)16 March 1998 (age 27) Düsseldorf, Germany
Height	1.93 m (6 ft 4 in)
Plays	Right-handed (two-handed backhand)
College	Baylor University
Prize money	US $548,835
Singles
Career record	0–0
Career titles	0
Highest ranking	No. 1226 (20 February 2023)
Doubles
Career record	42–45
Career titles	1
Highest ranking	No. 42 (9 June 2025)
Current ranking	No. 51 (22 September 2025)
Grand Slam doubles results
Australian Open	1R (2024,2025)
French Open	2R (2025)
Wimbledon	QF (2024)
US Open	QF (2025)
Last updated on: 23 September 2025.

Constantin Frantzen (born 16 March 1998) is a German tennis player who specializes in doubles.

Frantzen has a career highATP doubles ranking of world No. 42, achieved on 9 June 2025.^[1]

He played college tennis atBaylor University.^[2]

Frantzen made hisATP Tour doubles main draw debut at theSwiss Open Gstaad alongsideHendrik Jebens.

He reached his first ATP Tour final at theMoselle Open with partner Jebens, but lost toHugo Nys andJan Zieliński.^[3] Frantzen reached his second ATP Tour final at the2024 Generali Open Kitzbühel also alongside Jebens but lost toAlexander Erler andAndreas Mies.^[4] The pair also made it to the2024 Hangzhou Open final, losing toJeevan Nedunchezhiyan andVijay Sundar Prashanth in the final.^[5]

In September, Frantzen won his first doubles title on the ATP Tour at theChengdu Open, partneringRobin Haase.^[6]

Current through the2025 Vienna Open.

Result	W–L	Date	Tournament	Tier	Surface	Partner	Opponents	Score
Loss	0–1	Nov 2023	Moselle Open, France	ATP 250	Hard (i)	Hendrik Jebens	Hugo Nys Jan Zieliński	4–6, 4–6
Loss	0–2	Jul 2024	Austrian Open Kitzbühel, Austria	ATP 250	Clay	Hendrik Jebens	Alexander Erler Andreas Mies	3–6, 6–3, [6–10]
Loss	0–3	Sep 2024	Hangzhou Open, China	ATP 250	Hard	Hendrik Jebens	Jeevan Nedunchezhiyan Vijay Sundar Prashanth	6–4, 6–7(5–7), [7–10]
Win	1–3	Sep 2025	Chengdu Open, China	ATP 250	Hard	Robin Haase	Vasil Kirkov Bart Stevens	4–6, 6–3, [10–7]

Result	W–L	Date	Tournament	Surface	Partner	Opponents	Score
Loss	0–1	Sep 2022	Columbus, United States	Hard	Charles Broom	Julian Cash Henry Patten	2–6, 5–7
Loss	0–2	Oct 2022	Las Vegas, United States	Hard	Reese Stalder	Julian Cash Henry Patten	4–6, 6–7(1–7)
Loss	0–3	Mar 2023	Pau, France	Hard (i)	Julian Cash	Dan Added Albano Olivetti	6–3, 1–6, [8–10]
Loss	0–4	Mar 2023	Lugano, Switzerland	Hard (i)	Hendrik Jebens	Zizou Bergs David Pel	2–6, 6–7(6–8)
Win	1–4	Mar 2023	Biel/Bienne, Switzerland	Hard (i)	Hendrik Jebens	Victor Vlad Cornea Franko Škugor	6–2, 6–4
Loss	1–5	May 2023	Mauthausen, Austria	Clay	Hendrik Jebens	Romain Arneodo Sam Weissborn	4–6, 2–6
Win	2–5	Jun 2023	Heilbronn, Germany	Clay	Hendrik Jebens	Victor Vlad Cornea Philipp Oswald	7–6(9–7), 6–4
Loss	2–6	Jun 2023	Lyon, France	Clay	Hendrik Jebens	Manuel Guinard Grégoire Jacq	4–6, 6–2, [7–10]
Win	3–6	Aug 2023	Augsburg, Germany	Clay	Hendrik Jebens	Constantin Kouzmine Volodymyr Uzhylovskyi	6–2, 6–2
Win	4–6	Sep 2023	Como, Italy	Clay	Hendrik Jebens	Filip Bergevi Mick Veldheer	6–3, 6–4
Win	5–6	Sep 2023	Bad Waltersdorf, Austria	Clay	Hendrik Jebens	Marco Bortolotti Francesco Passaro	6–1, 6–2
Win	6–6	Oct 2023	Orléans, France	Hard (i)	Hendrik Jebens	Henry Patten John-Patrick Smith	7–6(7–5), 7–6(14–12)
Loss	6–7	Nov 2023	Ismaning, Germany	Carpet (i)	Hendrik Jebens	Sriram Balaji Andre Begemann	6–7(4–7), 4–6
Loss	6–8	Mar 2024	Lugano, Switzerland	Hard (i)	Hendrik Jebens	Sander Arends Sem Verbeek	7–6(11–9), 6–7(1–7), [8–10]
Win	7–8	May 2024	Mauthausen, Austria	Clay	Hendrik Jebens	Ryan Seggerman Patrik Trhac	6–4, 6–4
Win	8–8	Mar 2025	Naples, Italy	Clay	Alexander Erler	Geoffrey Blancaneaux Albano Olivetti	6–4, 6–4
Loss	8–9	Jun 2025	Sassuolo, Italy	Clay	Alexander Erler	Matthew Romios Ryan Seggerman	6–7(4–7), 6–3, [7–10]

Result	W–L	Date	Tournament	Surface	Partner	Opponents	Score
Win	1–0	Oct 2015	Ismaning, Germany	Carpet (i)	Alexander Erler	Kevin Krawietz Tim Sandkaulen	2–6, 7–5(7–5), [10–8]
Loss	1–1	Oct 2021	M15Lubbock, United States	Hard	Sven Lah	Sekou Bangoura Gijs Brouwer	4–6, 6–4, [5–10]
Loss	1–2	Nov 2021	M25Harlingen, United States	Hard	Gabi Adrian Boitan	Francis Alcantara Mark Whitehouse	6–7(3–7), 7–5, [7–10]
Loss	1–3	Feb 2022	M25Glasgow, United Kingdom	Hard (i)	Charles Broom	Gijs Brouwer Aidan McHugh	6–4, 6–7(1–7), [4–10]
Loss	1–4	Apr 2022	M15Monastir, Tunisia	Hard	Tim Sandkaulen	Szymon Kielan Michał Mikuła	6–7(4–7), 7–6(7–2), [2–10]
Win	2–4	Apr 2022	M15Monastir, Tunisia	Hard	Charles Broom	Li Zhe Bu Yunchaokete	7–5, 2–6, [10–8]
Win	3–4	May 2022	M15Meerbusch, Germany	Clay	Tim Sandkaulen	Miguel Fernando Pereira Gabriel Roveri Sidney	7–6(7–5), 6–4
Win	4–4	May 2022	M25Most, Czech Republic	Clay	Tim Sandkaulen	Marek Gengel David Poljak	6–3, 4–6, [10–7]
Loss	4–5	Jun 2022	M25Arlon, Belgium	Clay	Tim Sandkaulen	Anirudh Chandrasekar Vijay Sundar Prashanth	6–7(5–7), 4–6
Win	5–5	Jul 2022	M25Kassel, Germany	Clay	Tim Sandkaulen	Tom Gentzsch Leopold Zima	6–4, 6–2
Loss	5–6	Aug 2022	M25Wetzlar, Germany	Clay	Tim Sandkaulen	Benjamin Hassan Tristan Lamasine	4–6, 3–6

• Constantin Frantzen at theAssociation of Tennis Professionals
• Constantin Frantzen at theInternational Tennis Federation

• 1998 births
• Living people
• German male tennis players
• Sportspeople from Düsseldorf
• Tennis players from Düsseldorf (region)
• Baylor Bears men's tennis players
• German expatriate tennis players in the United States
• 21st-century German sportsmen

• Articles with short description
• Short description matches Wikidata
• Use dmy dates from March 2023