| Constantin Frantzen | |
| Birth Date: | 16 March 1998 |
| Birth Place: | Düsseldorf, Germany |
| Height: | 1.93 m |
| Plays: | Right-handed (two-handed backhand) |
| College: | Baylor University |
| Careerprizemoney: | $239,889 |
| Singlesrecord: | 0–0 |
| Singlestitles: | 0 |
| Highestsinglesranking: | No. 1226 (20 February 2023) |
| Doublesrecord: | 21–21 |
| Doublestitles: | 0 |
| Highestdoublesranking: | No. 46 (12 August 2024) |
| Currentdoublesranking: | No. 46 (19 August 2024) |
| Australianopendoublesresult: | 1R (2024) |
| Frenchopendoublesresult: | 1R (2024) |
| Wimbledondoublesresult: | QF (2024) |
| Updated: | 22 August 2024 |
Constantin Frantzen (born 16 March 1998) is a German tennis player who specializes in doubles.
Frantzen has a career high ATP doubles ranking of world No. 45, achieved on 12 August 2024.[1] He has won seven ATP Challenger doubles titles, all with partner Hendrik Jebens.
He played college tennis at Baylor University.[2]
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]
Current through the 2024 Winston-Salem Open.
| Tournament | 2023 | 2024 | SR | width=38 | W–L |
|---|---|---|---|---|---|
| Grand Slam tournaments | |||||
| Australian Open | A | 1R | 0 / 1 | 0–1 | |
| French Open | A | 1R | 0 / 1 | 0–1 | |
| Wimbledon | A | QF | 0 / 1 | 3–1 | |
| US Open | A | 0 / 0 | 0–0 | ||
| style=text-align:left | Win–loss | 0–0 | 3–3 | 0 / 3 | 3–3 |
| Career statistics | |||||
| Tournaments | 5 | 16 | 21 | ||
| style=text-align:left | Titles | 0 | 0 | 0 | |
| style=text-align:left | Finals | 1 | 1 | 2 | |
| style=text-align:left | Overall win–loss | 3–5 | 18–16 | 21–21 | |
| Year-end ranking | 65 | ||||
|
|
| Result | W–L | Date | Tournament | Tier | Surface | Partner | Opponents | Score | |
|---|---|---|---|---|---|---|---|---|---|
| Loss | 0–1 | Moselle Open, France | 250 Series | Hard (i) | Hendrik Jebens | Hugo Nys Jan Zieliński | 4–6, 4–6 | ||
| Loss | 0–1 | Austrian Open Kitzbühel, Austria | ATP 250 | Clay | Hendrik Jebens |  Alexander ErlerAndreas Mies | 3–6, 6–3, [6–10] |
| Finals by surface | |
|---|---|
| Hard (2–5) | |
| Clay (5–2) | |
| Carpet (0–1) |
| Result | W–L | Date | Tournament | Surface | Partner | Opponents | Score | ||
|---|---|---|---|---|---|---|---|---|---|
| Loss | 0–1 | Columbus, United States | Hard |  Charles Broom | Julian Cash Henry Patten | 2–6, 5–7 | |||
| Loss | 0–2 | Las Vegas, United States | Hard |  Reese Stalder | Julian Cash Henry Patten | 4–6, 6–7(1–7) | |||
| Loss | 0–3 | Pau, France | Hard (i) | Julian Cash |  Dan Added Albano Olivetti | 6–3, 1–6, [8–10] | |||
| Loss | 0–4 | Lugano, Switzerland | Hard (i) | Hendrik Jebens |  Zizou BergsDavid Pel | 2–6, 6–7(6–8) | |||
| Win | 1–4 | Biel/Bienne, Switzerland | Hard (i) | Hendrik Jebens |  Victor Vlad CorneaFranko Škugor | 6–2, 6–4 | |||
| Loss | 1–5 | bgcolor=moccasin | Mauthausen, Austria | Clay | Hendrik Jebens | Romain Arneodo Sam Weissborn | 4–6, 2–6 | ||
| Win | 2–5 | bgcolor=moccasin | Heilbronn, Germany | Clay | Hendrik Jebens | Victor Vlad Cornea Philipp Oswald | 7–6(9–7), 6–4 | ||
| Loss | 2–6 | bgcolor=moccasin | Lyon, France | Clay | Hendrik Jebens | Manuel Guinard Grégoire Jacq | 4–6, 6–2, [7–10] | ||
| Win | 3–6 | bgcolor=moccasin | Augsburg, Germany | Clay | Hendrik Jebens | Constantin Bittoun Kouzmine Volodymyr Uzhylovskyi | 6–2, 6–2 | ||
| Win | 4–6 | bgcolor=moccasin | Como, Italy | Clay | Hendrik Jebens |  Filip BergeviMick Veldheer | 6–3, 6–4 | ||
| Win | 5–6 | bgcolor=moccasin | Bad Waltersdorf, Austria | Clay | Hendrik Jebens |  Marco Bortolotti Francesco Passaro | 6–1, 6–2 | ||
| Win | 6–6 | bgcolor=moccasin | Orléans, France | Hard (i) | Hendrik Jebens | Henry Patten John-Patrick Smith | 7–6(7–5), 7–6(14–12) | ||
| Loss | 6–7 | bgcolor=moccasin | Ismaning, Germany | Carpet (i) | Hendrik Jebens |  Sriram BalajiAndre Begemann | 6–7(4–7), 4–6 | ||
| Loss | 6–8 | bgcolor=moccasin | Lugano, Switzerland | Hard (i) | Hendrik Jebens | Sander Arends Sem Verbeek | 7–6(11–9), 6–7(1–7), [8–10] | ||
| Win | 7–8 | bgcolor=moccasin | Mauthausen, Austria | Clay | Hendrik Jebens | Ryan Seggerman Patrik Trhac | 6–4, 6–4 |
| Finals by surface | |
|---|---|
| Hard (1–4) | |
| Clay (3–2) | |
| Carpet (1–0) |
| Result | W–L | Date | Tournament | Surface | Partner | Opponents | Score | |
|---|---|---|---|---|---|---|---|---|
| Win | 1–0 | Ismaning, Germany | Carpet (i) | Alexander Erler | Kevin Krawietz Tim Sandkaulen | 2–6, 7–5(7–5), [10–8] | ||
| Loss | 1–1 | M15 Lubbock, United States | Hard | Sven Lah | Sekou Bangoura Gijs Brouwer | 4–6, 6–4, [5–10] | ||
| Loss | 1–2 | M25 Harlingen, United States | Hard | Gabi Adrian Boitan | Francis Alcantara Mark Whitehouse | 6–7(3–7), 7–5, [7–10] | ||
| Loss | 1–3 | M25 Glasgow, United Kingdom | Hard (i) | Charles Broom | Gijs Brouwer Aidan McHugh | 6–4, 6–7(1–7), [4–10] | ||
| Loss | 1–4 | M15 Monastir, Tunisia | Hard | Tim Sandkaulen | Szymon Kielan Michał Mikuła | 6–7(4–7), 7–6(7–2), [2–10] | ||
| Win | 2–4 | M15 Monastir, Tunisia | Hard | Charles Broom |  Li Zhe Bu Yunchaokete | 7–5, 2–6, [10–8] | ||
| Win | 3–4 | M15 Meerbusch, Germany | Clay | Tim Sandkaulen | Miguel Fernando Pereira Gabriel Roveri Sidney | 7–6(7–5), 6–4 | ||
| Win | 4–4 | M25 Most, Czech Republic | Clay | Tim Sandkaulen |  Marek Gengel David Poljak | 6–3, 4–6, [10–7] | ||
| Loss | 4–5 | M25 Arlon, Belgium | Clay | Tim Sandkaulen | Anirudh Chandrasekar Vijay Sundar Prashanth | 6–7(5–7), 4–6 | ||
| Win | 5–5 | M25 Kassel, Germany | Clay | Tim Sandkaulen | Tom Gentzsch Leopold Zima | 6–4, 6–2 | ||
| Loss | 5–6 | M25 Wetzlar, Germany | Clay | Tim Sandkaulen | Benjamin Hassan Tristan Lamasine | 4–6, 3–6 |