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.
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.