WATCH: Former No. 1 Caroline Wozniacki to retire after Australian Open

29-year-old tennis star Caroline Wozniacki will retire in 2020.

29-year-old Danish tennis star Caroline Wozniacki wrote in an Instagram post on Friday that she wants to start a family with her husband, former NBA player David Lee, and work to raise awareness about rheumatoid arthritis, and plans to call it a career after the 2020 Australian Open.

At 19, Wozniacki was the runner-up to Kim Clijsters at the 2009 U.S. Open, then again was the runner-up at Flushing Meadows in 2014 to her good friend Serena Williams. Wozniacki became the No. 1 player in the world in October of 2010, and has one career Grand Slam win, which came at the 2018 Australian Open.

When she carried the flag for Denmark at the opening ceremony for the 2016 Rio Olympic Games, Wozniacki said, “I’ve accomplished everything I could ever dream of on the court.”

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Former No. 1 Caroline Wozniacki to retire after Australian Open

The 29-year-old from Denmark wrote in an Instagram post on Friday that she wants to start a family with her husband, former NBA player David Lee, and work to raise awareness about rheumatoid arthritis.

The 29-year-old from Denmark wrote in an Instagram post on Friday that she wants to start a family with her husband, former NBA player David Lee, and work to raise awareness about rheumatoid arthritis.