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Anna Sergeyevna Danilina (Russian: Анна Сергеевна Данилина; born 20 August 1995) is a Russian-born Kazakhstani tennis player. She has been ranked as high as No. 10 in doubles by the WTA. In singles, she reached a career-high ranking of No. 269. She is a Grand Slam mixed doubles champion, having won the US Open in 2023 together with Harri Heliövaara.
Danilina represented Russia, her nation of birth, until March 2011 when at the age of 15 she switched allegiances to represent Kazakhstan. As a junior, she reached a combined world ranking of No. 3 in February 2013. Since turning professional, Danilina has won five WTA doubles titles and one WTA Challenger doubles title. She has also won one singles title and 27 doubles titles on the ITF Circuit. Along with Beatriz Haddad Maia, Danilina attained her Grand Slam doubles breakthrough, reaching the women's doubles final of the 2022 Australian Open.