The US Open begins with defending champion Novak Djokovic and third seed Roger Federer both in action.

There is also a blockbuster first-round clash between Serena Williams and Maria Sharapova, while four Brits are also in action on day one.

Here, PA previews the opening day at Flushing Meadows.

Order of play

Undoubtedly the grudge match between Serena Williams, the six-time champion, and 2006 winner Maria Sharapova. It might not be a classic of the past but the combustible American versus the ice-cold Russian will be box office on opening night.