Tennis stars Serena Williams and Caroline Wozniacki are rivals on the court, but the stunners are best pals away from the sport.
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Seventeen-time Grand Slam champ Serena and former world number one Caroline are due to face each other in the WTA Championships on Saturday.
However, that up-coming engagement did not prevent them from meeting up and going out together to watch Mariah Carey perform in Singapore last night…
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