Constantin Bittoun Kouzmine (born 4 January 1999) is a French tennis player. Bittoun Kouzmine has a career high ATP singles ranking of No. 424 achieved on 3 August 2026 and a career high ATP doubles ranking of No. 176 achieved on 5 October 2026.
Career 2023: First Challenger Final In August, Bittoun Kouzmine reached his first Challenger doubles final at the 2023 Schwaben Open, partnering with Volodoymyr Uzhylovskyi. The pair lost to Constantin Frantzen and Hendrik Jebens in the final.
2025: Maiden Challenger Doubles Title In April, Bittoun Kouzmine won his maiden Challenger doubles title at the 2025 Côte d'Ivoire Open II, partnering with Aziz Ouakaa. The pair defeated Aleksandre Bakshi and S D Prajwal Dev in the final.
2026: First Challenger Single final In July, Bittoun Kouzmine reached his first Challenger single final at the Samsun Open. He lost to compatriot Gabriel Debru in the final.
ATP Challengers Finals Singles: 1 (1 runner-up) Legend ATP Challenger (0–1)Finals by surfaceHard (0–1)Clay (0–0)
ResultW–LDateTournamentTierSurfaceOpponentScoreLoss0–1Samsun Open, TurkeyChallengerHard Gabriel Debru6–3, 5–7, 4–6
Doubles: 8 (4 titles, 4 runner-ups) Legend ATP Challenger (4–4)Finals by surfaceHard (4–3)Clay (0–1)
ResultW–LDateTournamentTierSurfacePartnerOpponentsScoreLoss0–1Augsburg, GermanyChallengerClay Volodoymyr Uzhylovskyi Constantin Frantzen Hendrik Jebens2–6, 2–6Loss0–2Bengaluru, IndiaChallengerHard Maxime Janvier Saketh Myneni Ramkumar Ramanathan3–6, 4–6Win1–2Abidjan, Ivory CoastChallengerHard Aziz Ouakaa Aleksandre Bakshi S D Prajwal Dev7–6(7–5), 7–5Loss1–3Abidjan, Ivory CoastChallengerHard Robert Strombachs Oskar Brostrøm Poulsen Billy Suarez6–7(0–7), 0–6Win2–3Centurion, South AfricaChallengerHard Robert Strombachs Mert Alkaya Arda Azkara6–4, 6–4Win3–3Phan Thiết III, VietnamChallengerHard S D Prajwal Dev Yamato Sueoka Naoki Tajima6–1, 7–6(7–0)Win4–3Phan Thiết IV, VietnamChallengerHard S D Prajwal Dev Joshua Charlton Yuta Shimizu6–4, 7–6(7–1)Loss4–4Saint-Tropez, FranceChallengerHard Daniel Masur Jakub Paul Matej Vocel4–6, 3–6
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