Ksenia Yuryevna Pervak (Russian: Ксения Юрьевна Первак; born 27 May 1991 in Chelyabinsk, Soviet Union) is a Russian professional tennis player.
Pervak won one singles title on the WTA tour, as well as nine singles and three doubles titles on the ITF circuit in her career. On 19 September 2011, she reached her best singles ranking of world No. 37. On 30 January 2012, she peaked at No. 123 in the doubles rankings.
Pervak won the 2009 Australian Open – Girls' Singles tournament, defeating Laura Robson in straight sets in the final.
In November 2015, Pervak announced her retirement from professional tennis due to chronic injuries. However, she returned to tennis on 18 September 2016, making her comeback at an ITF St. Petersburg tournament the day after.
Pervak made it to the second round of the PTT Pattaya Women's Open but lost to second seed Caroline Wozniacki of Denmark in three sets. Pervak then won three qualifying matches to advance to the main draw in 's-Hertogenbosch. She defeated Czech Petra Cetkovská in the first round. Pervak also won the Australian Open junior tournament in that year, defeating Laura Robson in the final.
In early February, Pervak lost in the first round of the Pattaya City Open to then world No. 14, Vera Zvonareva. Pervak then reached the Malaysian Open main draw but lost to Noppawan Lertcheewakarn in the first round. At the French Open, Pervak reached the main draw but lost to Maria Sharapova in the first round. At the Banka Koper Slovenia Open, Pervak reached her first WTA tour semifinal but retired to Johanna Larsson due to a wrist injury.
At the Guangzhou International Women's Open, Pervak defeated the number two seed Chan Yung-jan in the first round. She then reached the quarterfinals by defeating Russian compatriot Alexandra Panova, winning 24 of 27 points in the final set.
Pervak kicked off her 2011 season in Brisbane, Australia, where she was seeded seventh for the qualifying draw of the Brisbane International. She defeated Jessica Moore and Alexandra Panova, but was defeated by Anastasia Pivovarova in the third qualifying round. She gained entry into the main draw as a lucky loser and defeated Anna Chakvetadze in the first round, before losing in the second to Petra Kvitová.
Pervak played in the first round of the main draw of the Australian Open for the first time in her career, but lost to 13th seed and fellow Russian Nadia Petrova.
Pervak made the semifinals of the $100,000 ITF event in Midland, losing to eventual champion Lucie Hradecká. She made two consecutive quarterfinals of WTA events in Memphis and Monterrey, losing to Hradecká and Gisela Dulko respectively.
Pervak lost in qualifying at the BNP Paribas Open at Indian Wells to Jamie Hampton. However, she qualified for the Sony Ericsson Open in Miami, defeating Zuzana Kučová and Junri Namigata. She lost in the fourth round of Wimbledon to Tamira Paszek in three sets.
At the Brisbane International, Pervak scored the first top-10 victory of her career by defeating former world No. 1 Caroline Wozniacki in the first round, winning in a final set tiebreak. She later faced top seed Victoria Azarenka in the quarterfinals and was heavily defeated.
Pervak was unseeded at the Australian Open. She defeated 32nd seed Mona Barthel in the first round, but subsequently lost her match against Heather Watson in three sets, despite holding three match points in the second set tiebreak. She realigned her allegiance with Russia in June 2013.