World No.1 Iga Swiatek reached the fourth round of the US Open on Saturday with a 6-3, 6-4 victory over unseeded Lauren Davis of the United States.  French Open champion Swiatek came back from 1-4 down in the second set to reel off five successive games against the American who called a medical time out in the first set to have her blood pressure taken.

The 21-year-old Pole will face Wimbledon quarter-finalist Jule Niemeier of Germany for a place in the last eight. 

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