On-court enemies get close. In just over 24 hours, five-time champion Serena Williams and former world number one Caroline Wozniacki will step out on court as rivals in the final of the 2014 US Open.
However, their relationship seemed very friendly on Saturday afternoon when Serena uploaded a picture of herself all smiles with the Danish star.
Wozniacki, who has never previously won a Grand Slam, has played Serena nine times to date, beating the American just once.
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