The Keeping Up With The Kardashians star was on hand to support her pal Serena Williams, as she took on sister Venus in the quarter final on Tuesday, 8 September.
Kim, 34, wore white jeans and an olive green top, along with a floor-length black coat and heels, for the match at Flushing Meadows, also attended by her sister Kendall Jenner, 19.
She was pictured sitting alongside Kendall and their publicist friend Simon Huck, while Gigi Hadid and Joe Jonas were also in the VIP box.
Kim dned with Serena, 33, two nights before, catching up over dinner and tea (which Kim spilled!) at the Carbone Italian restaurant in Manhattan.
Serena beat sister Venus 6-2 1-6 6-3 to reach the semi-final.
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