Daniil Ostapenkov (born May 8, 2003) is a Belarusian professional tennis player. He achieved a career-high junior ITF ranking of world No. 48. He has a career high singles ranking of No. 525 achieved on 10 August 2026 and a career high doubles ranking of No. 261 achieved on 24 November 2025.
Career Ostapenkov is best known for his shocking upset win, in straight sets, over world No. 15 and former world No. 8 Diego Schwartzman during a Davis Cup match against Argentina. At the time, Ostapenkov did not have an ATP ranking.
Personal info In April 2024, Daniil became an ambassador for the IT company BackHandStats.
ATP Challenger and ITF Tour finals
Doubles: 3 (2–1)
Legend (doubles)ATP Challenger Tour (0–0)ITF World Tennis Tour (2–1)Titles by surfaceHard (2–0)Clay (0–1)Grass (0–0)
ResultW–LDateTournamentTierSurfacePartnerOpponentScoreLoss0–1M25 Tbilisi, GeorgiaWorld Tennis TourClay Erik Arutiunian Ivan Liutarevich Grigoriy Lomakin6–3, 6–7(4–7), [5–10]Win1–1M15 Sharm El Sheikh, EgyptWorld Tennis TourHard Erik Arutiunian Lukas Kreiner Robert Strombachs6–3, 6–4Win2–1M25 Monastir, TunisiaWorld Tennis TourHard Erik Arutiunian Neil Oberleitner Oleksandr Ovcharenko6–1, 6–7(3–7), [10–6]
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