Novak Djokovic is back at world number one after beating Alexandre Muller in straight sets and Iga Swiatek began her title defence by dropping only one game against Rebecca Peterson.
Britain’s Lily Miyazaki made a mark on her Flushing Meadows debut to reach round two. Here, the PA news agency looks back at day one at the US Open.
Former first lady Michelle Obama joined a ceremony to honour former champion and equality campaigner Billie Jean King, and celebrate 50 years since the US Open offered equal prize money to men and women.
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