Constantin Frantzen

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

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 $428,298
Singles
Career record	0–0
Career titles	0
Highest ranking	No. 1226 (20 February 2023)
Doubles
Career record	32–40
Career titles	0
Highest ranking	No. 42 (9 June 2025)
Current ranking	No. 49 (16 June 2025)
Grand Slam doubles results
Australian Open	1R (2024, 2025)
French Open	2R (2025)
Wimbledon	QF (2024)
US Open	1R (2024)
Last updated on: 22 June 2025.

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

He played college tennis at Baylor University.^[2]

Career

2023–2024: ATP and Grand Slam debuts in doubles

Frantzen made his ATP Tour doubles main draw debut at the Swiss Open Gstaad alongside Hendrik Jebens.

He reached his first ATP Tour final at the Moselle Open with partner Jebens, but lost to Hugo Nys and Jan Zieliński.^[3] Frantzen reached his second ATP Tour final at the 2024 Generali Open Kitzbühel also alongside Jebens but lost to Alexander Erler and Andreas Mies.^[4] The pair also made it to the 2024 Hangzhou Open final, losing to Jeevan Nedunchezhiyan and Vijay Sundar Prashanth in the final.^[5]

Doubles performance timeline

Key

W

F

SF

QF

#R

RR

Q#

DNQ

A

NH

(W) winner; (F) finalist; (SF) semifinalist; (QF) quarterfinalist; (#R) rounds 4, 3, 2, 1; (RR) round-robin stage; (Q#) qualification round; (DNQ) did not qualify; (A) absent; (NH) not held; (SR) strike rate (events won / competed); (W–L) win–loss record.

To avoid confusion and double counting, these charts are updated at the conclusion of a tournament or when the player's participation has ended.

Current through the 2025 Swiss Open Gstaad.

Tournament	2023	2024	2025	SR	W–L
Grand Slam tournaments
Australian Open	A	1R	1R	0 / 2	0–2
French Open	A	1R	2R	0 / 2	1–2
Wimbledon	A	QF	3R	0 / 2	5–2
US Open	A	1R		0 / 1	0–1
Win–loss	0–0	3–4	3–3	0 / 7	6–7
ATP Masters 1000
Indian Wells Open	A	A	1R	0 / 1	0–1
Miami Open	A	A	1R	0 / 1	0–1
Madrid Open	A	A	2R	0 / 1	1–1
Win–loss	0–0	0–0	1–3	0 / 3	1–3
Career statistics
Tournaments	5	20	19	44
Titles	0	0	0	0
Finals	1	2	0	3
Overall win–loss	3–5	19–20	13–18	35–43
Year-end ranking	65	52		45%

ATP Tour finals

Doubles: 3 (3 runner-ups)

Legend Grand Slam tournaments (0–0) ATP Masters 1000 (0–0) ATP 500 (0–0) ATP 250 (0–3)

Finals by surface Hard (0–2) Clay (0–1) Grass (0–0)

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]

ATP Challenger finals

Doubles: 17 (8 titles, 9 runner-ups)

Finals by surface
Hard (2–5)
Clay (6–3)
Carpet (0–1)

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]

ITF World Tennis Tour finals

Doubles: 11 (5–6)

Finals by surface
Hard (1–4)
Clay (3–2)
Carpet (1–0)

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	M15 Lubbock, United States	Hard	Sven Lah	Sekou Bangoura Gijs Brouwer	4–6, 6–4, [5–10]
Loss	1–2	Nov 2021	M25 Harlingen, United States	Hard	Gabi Adrian Boitan	Francis Alcantara Mark Whitehouse	6–7(3–7), 7–5, [7–10]
Loss	1–3	Feb 2022	M25 Glasgow, United Kingdom	Hard (i)	Charles Broom	Gijs Brouwer Aidan McHugh	6–4, 6–7(1–7), [4–10]
Loss	1–4	Apr 2022	M15 Monastir, Tunisia	Hard	Tim Sandkaulen	Szymon Kielan Michał Mikuła	6–7(4–7), 7–6(7–2), [2–10]
Win	2–4	Apr 2022	M15 Monastir, Tunisia	Hard	Charles Broom	Li Zhe Bu Yunchaokete	7–5, 2–6, [10–8]
Win	3–4	May 2022	M15 Meerbusch, Germany	Clay	Tim Sandkaulen	Miguel Fernando Pereira Gabriel Roveri Sidney	7–6(7–5), 6–4
Win	4–4	May 2022	M25 Most, Czech Republic	Clay	Tim Sandkaulen	Marek Gengel David Poljak	6–3, 4–6, [10–7]
Loss	4–5	Jun 2022	M25 Arlon, Belgium	Clay	Tim Sandkaulen	Anirudh Chandrasekar Vijay Sundar Prashanth	6–7(5–7), 4–6
Win	5–5	Jul 2022	M25 Kassel, Germany	Clay	Tim Sandkaulen	Tom Gentzsch Leopold Zima	6–4, 6–2
Loss	5–6	Aug 2022	M25 Wetzlar, Germany	Clay	Tim Sandkaulen	Benjamin Hassan Tristan Lamasine	4–6, 3–6