Tennis stars pull emoji faces

Tennis stars including Serena Williams, Maria Sharapova and Petra Kvitova pull some funny faces as they take on the WTA's emoji challenge.

Caroline Wozniacki, and Ana Ivanovic also take part in the fun, along with Eugenie Bouchard, Simona Halep, Ekaterina Makarova and Garbine Muguruza.

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