Her win streak of five tournaments and 27 matches came to an end in April with a semifinal loss to Latisha Chan at the International Juniors Championships in Manila, her first event outside of Scandinavia as well as her first Grade 1 event. With this success, she moved up to Grade 3 and Grade 4 tournaments, winning her first four singles events of 2004. Wozniacki reached the final at both singles events, winning the second over compatriot Hanne Skak Jensen. During her first month, she entered two Grade 5 events in Denmark, the lowest-level tournament on the tour. She made her debut on the ITF Junior Circuit, the premier 18-and-under junior tour that is run by the International Tennis Federation (ITF), in October 2003 at 13 years and 3 months old. Wozniacki had a career-high junior ranking of No. Her older brother, Patrik Wozniacki, is a former professional footballer in Denmark. The couple moved to Denmark when Piotr signed for the Danish football club Boldklubben 1909. Her mother Anna played on the Polish women's national volleyball team, and her father Piotr played professional football. Wozniacki retired on 24 January 2020, following a third-round loss at the Australian Open.

Her other major career highlights include winning three Premier Mandatory and three Premier 5 titles, reaching four Grand Slam semifinals (the 2011 Australian Open and the 2010, 20 US Opens, three Grand Slam quarterfinals (the 2012 Australian Open and the 20 French Opens), and the quarterfinals at the 2012 London Olympics. Wozniacki also won the season-ending WTA Finals in Singapore in 2017, beating Venus Williams, after finishing runner-up to Clijsters at the event in 2010. Previously, she had reached two Grand Slam finals at the US Open, falling to Kim Clijsters in 2009 and to her friend Serena Williams at the 2014 US Open. She won a Grand Slam singles title at the 2018 Australian Open, beating Simona Halep and becoming the first Dane to win a Grand Slam singles title. A junior Grand Slam champion, she won the 2006 Wimbledon girls' singles title over Magdaléna Rybáriková, and was voted the WTA Newcomer of the Year in 2008.

Known for her footwork and defensive abilities, Wozniacki won 30 WTA singles titles (including six in both 20, the most in a year by a WTA player from 2008–2011) and two doubles titles. In 2018, she became the first Dane to win a Grand Slam singles title, after winning the 2018 Australian Open. She achieved the top ranking for the first time on 11 October 2010, becoming the 20th player in the Open era and the first woman from a Scandinavian country to hold the top position.

1 in singles for a total of 71 weeks, including at the end of 20. Wozniacki at the 2017 Eastbourne InternationalĬaroline Wozniacki R ( Danish: born 11 July 1990) is a Danish former professional tennis player.

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