Highlights of day four of the 2016 US Open tournament

Updated: 2016-09-02 10:40

(Agencies)

Highlights of day four of the 2016 US Open tournament

Serena Williams of the USA hits to Vania King of USA (not pictured) on day four of the 2016 US Open tennis tournament at USTA Billie Jean King National Tennis Center in New York, US, on Sept 1, 2016. [Photo/Agencies]

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