World number one, Iga Swiatek came out on top in a meeting of Grand Slam champions as she beat Sloane Stephens to reach the US Open third round.
Two-time French Open winner, Swiatek beat American Stephens, who won the 2017 US Open, 6-3 6-2.
Swiatek will next face American Lauren Davis who beat 28th seed Ekaterina Alexandrova 0-6 6-4 7-6 (10-5).
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Swiatek has won 52 matches this year, including a 37-match winning streak that included her French Open title win.
However, she has not gone beyond the quarter-final stage of a tournament since losing in the third round at Wimbledon in July.