The men and women's world number one performed during day six at Flushing Meadows.
Browse through images from the day's play in the gallery below.
In Pictures: US Open Day Six
By Liam Apicella, Features Editor
Day six of the US Open saw Roger Federer, Novak Djokovic, Serena Williams, Ana Ivanovic and Caroline Wozniacki all in action.
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