Besties Off the Court: Serena Williams and Caroline Wozniacki

Besties Off the Court: Serena Williams and Caroline Wozniacki

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Serena Williams joins Taylor Swift onstage during The 1989 World Tour at Hyde Park on June 27, 2015 in London. Serena attended the concert with Caroline Wozniacki, and the two posted photos via Twitter and Instagram.

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Serena Williams, Caroline Wozniacki and Eva Longoria attend the Champ'Seed party on May 19, 2015 in Monaco.

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Caroline Wozniacki and Serena Williams laugh together while attending the New York Knicks game against the Washington Wizards at Madison Square Garden on Nov. 4, 2014 in New York City.

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Caroline Wozniacki and Serena Williams flinch at a loose ball as Spike Lee looks on during the New York Knicks game against the Washington Wizards at Madison Square Garden on Nov. 4, 2014 in New York City.

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Serena Williams and Caroline Wozniacki attend the 11th annual CFDA/Vogue Fashion Fund Awards at Spring Studios on Nov. 3, 2014 in New York City.

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Caroline Wozniacki and Serena Williams pose with Stella McCartney during the 11th annual CFDA/Vogue Fashion Fund Awards at Spring Studios on Nov. 3, 2014 in New York City.

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Serena Williams and Caroline Wozniacki hug as the media looks on after Wozniacki finished the New York City Marathon in Central Park on Nov. 2, 2014 in New York City.

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Serena Williams and Caroline Wozniacki celebrate after Wozniacki received a medal for completing the New York City Marathon in Central Park on Nov. 2, 2014 in New York City.

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Serena Williams and Caroline Wozniacki attend the New York Rangers game against the Winnipeg Jets at Madison Square Garden on Nov. 1, 2014 in New York City.

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Serena Williams and Caroline Wozniacki enjoy some popcorn during the New York Rangers game against the Winnipeg Jets at Madison Square Garden on Nov. 1, 2014 in New York City.

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Caroline Wozniacki and Serena Williams walk from the Marina Bay Sands Hotel to the draw ceremony prior to the start of the BNP Paribas WTA Finals at Singapore Sports Hub on Oct. 18, 2014 in Singapore.

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Serena Williams and Caroline Wozniacki pose with Anna Wintour at the Serena Williams Signature Statement by HSN fashion show during Style360 Spring 2015 at Metropolitan West on Sept. 9, 2014 in New York City.

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Caroline Wozniacki and Serena Williams chat with Alexis Stoudemire backstage at the Serena Williams Signature Statement by HSN fashion show during Style360 Spring 2015 at Metropolitan West on Sept. 9, 2014 in New York City.

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Serena Williams and Caroline Wozniacki pose together in the water on May 31, 2014 in Miami Beach.

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Caroline Wozniacki and Serena Williams laugh together on May 31, 2014 in Miami Beach.

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Serena Williams and Caroline Wozniacki stand on the court after the Miami Heat defeated the Indiana Pacers in Game Six of the Eastern Conference Finals on May 30, 2014 at American Airlines Arena in Miami.

Serena Williams and Caroline Wozniacki pose with Greg Oden and the Eastern Conference championship trophy after the Miami Heat defeated the Indiana Pacers in Game Six of the Eastern Conference Finals on May 30, 2014 at American Airlines Arena in Miami.