Caroline Wozniacki (Danish pronunciation: [kɑːo.liːnə ʋʌsni'ɑɡ̊i], Polish pronunciation: [voʑˈɲatski]; born 11 July 1990) is a Danish professional tennis player. She is a former World No. 1 on the WTA Tour. As of 23 January 2012, she held this position for 67 weeks. She was the first Scandinavian woman to hold the top ranking position and 20th overall.
Since her WTA debut in 2005, she has improved her year-end ranking each year until finishing on top in both 2010 and 2011. She has won 20 WTA singles titles as of October 2012, three in 2008, three in 2009, six in 2010 (the most since Justine Henin's ten in 2007), six in 2011 and two in 2012. She was runner-up at the 2009 US Open and the 2010 WTA Tour Championships in Doha to Kim Clijsters. She won the 2006 Wimbledon Girls' Singles title but has yet to win a women's Grand Slam title. She also holds two WTA titles in doubles.
Wozniacki is the daughter of Polish Roman Catholic immigrants, Piotr and Anna Wozniacki. Anna played on the Polish women's national volleyball team, and Piotr played professional football. The couple moved to Denmark when Piotr signed for the Danish football club Boldklubben 1909.Wozniacki's older brother Patrik Wozniacki is a professional footballer for Hvidovre IF in Denmark.
Wozniacki's best friend is her fellow Danish tennis player Malou Ejdesgaard, who has been her doubles partner in five tournaments.
When asked in 2008 by Teen Vogue magazine what sports beside tennis she liked to play, Wozniacki said "I like handball, soccer, swimming, playing the piano, and all kinds of different things."
On 20 December 2010, she signed a three-year deal to endorse Turkish Airlines' business class service.
According to Forbes in 2011 she was the second highest earning female athlete in the world.
According to the June 2011 edition of SportsPro Wozniacki is the world's ninth most marketable athlete.
She is currently dating Northern Irish professional golfer Rory McIlroy.