Constantin Frantzen

Constantin Frantzen (born 16 March 1998) is a tennis player from Germany. Frantzen has a career-high singles ranking of No. 1226, and a career-high doubles ranking of No. 94.

Doubles

 * 🇫🇷 Pau (27 Feb 2023) – 🇫🇷 Dan Added / 🇫🇷 Albano Olivetti def. 🇬🇧 Julian Cash / 🇩🇪 Constantin Frantzen, 3–6, 6–1, [10–8].
 * Lugano (6 Mar 2023) – 🇧🇪 Zizou Bergs / David Pel def. 🇩🇪 Constantin Frantzen / 🇩🇪 Hendrik Jebens, 6–2, 7–6(8–6).
 * Biel/Bienne (20 Mar 2023) – 🇩🇪 Constantin Frantzen / 🇩🇪 Hendrik Jebens def. 🇷🇴 Victor Vlad Cornea / Franko Škugor, 6–2, 6–4.
 * 🇦🇹 Mauthausen (8 May 2023) – Romain Arneodo / 🇦🇹 Sam Weissborn def. 🇩🇪 Constantin Frantzen / 🇩🇪 Hendrik Jebens, 6–4, 6–2.
 * 🇩🇪 Heilbronn (5 Jun 2023) – 🇩🇪 Constantin Frantzen / 🇩🇪 Hendrik Jebens def. 🇷🇴 Victor Vlad Cornea / 🇦🇹 Philipp Oswald, 7–6(9–7), 6–4.
 * 🇫🇷 Lyon (12 Jun 2023) – 🇫🇷 Manuel Guinard / 🇫🇷 Grégoire Jacq def. 🇩🇪 Constantin Frantzen / 🇩🇪 Hendrik Jebens, 6–4, 2–6, [10–7].
 * 🇩🇪 Augsburg (21 Aug 2023) – 🇩🇪 Constantin Frantzen / 🇩🇪 Hendrik Jebens def. 🇫🇷 Constantin Bittoun Kouzmine / 🇺🇦 Volodymyr Uzhylovskyi, 6–2, 6–2.