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Constantin Frantzen
Constantin Frantzen
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Constantin Frantzen (born 16 March 1998) is a German professional tennis player who specializes in doubles. He has a career-high ATP doubles ranking of world No. 35 achieved on 23 February 2026.[1]

Key Information

Frantzen has won one ATP Tour doubles title at the 2025 Chengdu Open, with Robin Haase.

He played college tennis at Baylor University.[2]

Career

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2023–2024: ATP and major debuts in doubles

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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]

2025: Maiden ATP title

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In September, Frantzen won his first doubles title on the ATP Tour at the Chengdu Open, playing alongside Robin Haase.[6]

Doubles performance timeline

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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 2026 Mexican Open.

Tournament 2023 2024 2025 2026 SR W–L
Grand Slam tournaments
Australian Open A 1R 1R 1R 0 / 3 0–3
French Open A 1R 2R 0 / 2 1–2
Wimbledon A QF 3R 0 / 2 5–2
US Open A 1R QF 0 / 2 3–2
Win–loss 0–0 3–4 6–4 0–1 0 / 9 9–9
ATP 1000 tournaments
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 0–0 0 / 3 1–3
Career statistics
Tournaments 5 20 25 7 57
Titles 0 0 1 0 1
Finals 1 2 1 2 6
Overall win–loss 3–5 19–20 23–23 9–7 54–55
Year-end ranking 65 52 48 50%

ATP Tour finals

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Doubles: 6 (1 title, 5 runner-ups)

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Legend
Grand Slam (–)
ATP 1000 (–)
ATP 500 (0–1)
ATP 250 (1–4)
Finals by surface
Hard (1–3)
Clay (0–2)
Grass (–)
Finals by setting
Outdoor (1–3)
Indoor (0–2)
Result W–L    Date    Tournament Tier Surface Partner Opponents Score
Loss 0–1 Nov 2023 Moselle Open,
France 		ATP 250 Hard (i) Germany Hendrik Jebens Monaco Hugo Nys
Poland Jan Zieliński 		4–6, 4–6
Loss 0–2 Jul 2024 Austrian Open Kitzbühel,
Austria 		ATP 250 Clay Germany Hendrik Jebens Austria Alexander Erler
Germany Andreas Mies 		3–6, 6–3, [6–10]
Loss 0–3 Sep 2024 Hangzhou Open,
China 		ATP 250 Hard Germany Hendrik Jebens India Jeevan Nedunchezhiyan
India Vijay Sundar Prashanth 		6–4, 6–7(5–7), [7–10]
Win 1–3 Sep 2025 Chengdu Open,
China 		ATP 250 Hard Netherlands Robin Haase United States Vasil Kirkov
Netherlands Bart Stevens 		4–6, 6–3, [10–7]
Loss 1–4 Feb 2026 Open Occitanie,
France 		ATP 250 Hard (i) Netherlands Robin Haase France Théo Arribagé
France Albano Olivetti 		6–7(6–8), 1–6
Loss 1–5 Feb 2026 Rio Open,
Brazil 		ATP 500 Clay Netherlands Robin Haase Brazil João Fonseca
Brazil Marcelo Melo 		6–4, 3–6, [8–10]

ATP Challenger finals

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

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

ITF Tour finals

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Doubles: 11 (5 titles, 6 runner-ups)

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

References

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