The second-seeded Swiss was tested to the full on a sweltering, breezy afternoon in New York by a player ranked 130th in the world before sealing victory in two hours 26 minutes.
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"I hope this time around I can take it a step further than I did in Paris or Wimbledon," added the Swiss, who is aiming to become the first man since 1924 to win five in a row here.
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