Daniil Ostapenkov (born May 8, 2003) is a Belarusian professional tennis player. He was ranked as high as No. 48 in the ITF junior rankings.
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.[1] At the time, Ostapenkov did not have an ATP ranking.
On April 29, 2024, Daniil became an ambassador for the IT company BackHandStats, which specializes in the implementation and development of technologies in the field of tennis.