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Caroline Wozniacki has appeared in Sports Illustrated's famous swimsuit edition this year. Dave Rowland/Getty Images
Wozniacki isn't the first tennis player to appear in the edition. Anthony Au-Yeung/Getty Images
Maria Sharapova graced the pages of the U.S. publication's swimsuit edition in 2006. WILLIAM WEST/AFP/Getty Images
Ana Ivanovic, like Wozniacki and Sharapova, is a former world No. 1. She was in the swimsuit edition in 2010. Bryan Bedder/Getty Images for BNP Paribas
And Serena Williams, seen here with coach Patrick Mouratoglou, featured in the swimsuit edition in 2003. Williams, the current No. 1, is good friends with Wozniacki. Clive Brunskill/Getty Images)
