She's in red hot form but Wimbledon champion Garbine Muguruza feels she has a point to prove at the US tennis Open.

The Spaniard has never gone past the second round at Flushing Meadows but has started with a straight sets demolition of American Vavara Lepchenko.

She says having a dark past with the results she came in with low expectations so is treating each match as a final.

2014 champion Marin Cilic, eighth seed Jo-Wilfried Tsonga and American hope John Isner are among the early winners in the men's draw.

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Later today women's second seed Simona Halep headlines the evening session against Maria Sharapova, in the Russian's first grand slam match since returning from a drugs ban.