Caroline Wozniacki (Danish: [kʰɑʁoˈliːnə vʌsniˈɑkʰi]; born 11 July 1990) is a Danish former professional tennis player. She has been ranked as the world No. 1 in women's singles by the WTA, holding the position for a total of 71 weeks (including as the year-end world No. 1 in 2010 and 2011). Wozniacki has won 30 WTA Tour-level singles titles, including a major at the 2018 Australian Open as well as the 2017 WTA Finals. Wozniacki had a successful junior career, winning the junior title at the 2006 Wimbledon Championships. After being named the WTA Newcomer of the Year in 2008, she contested two major finals at the 2009 and 2014 US Opens, as well as the final at the 2010 WTA Tour Championships, becoming the world No. 1 in 2010. Wozniacki retired from the sport following the 2020 Australian Open. In 2022, she became a commentator for Tennis Channel and ESPN, before beginning a professional comeback at the 2023 Canadian Open and the US Open. She is known for her footwork and defensive skill. In November 2025, Wozniacki indicated that she was likely finished with professional tennis following her comeback.