World number one Iga Swiatek ended up as the winner in a gathering of Grand Slam champions as she beat Sloane Stephens to arrive at the US Open third round
Double cross French Open champ Swiatek beat American Stephens, who won the 2017 US Open, 6-3 6-2.
Swiatek will next confront American Lauren Davis who beat 28th seed Ekaterina Alexandrova 0-6 6-4 7-6 (10-5).
Eighth seed Jessica Pegula and three-time finalist Victoria Azarenka additionally progressed on day four in New York.
Swiatek has won 52 matches this year, including a 37-match series of wins that incorporated her French Open title win.
In any case, she has not gone past the quarter-last phase of a competition since losing in the third round at Wimbledon in July.
American Pegula, who has arrived at the Australian Open and French Open quarter-finals this year, beat Aliaksandra Sasnovich of Belarus 6-4 6-4.
Last week, Kostyuk reprimanded the choice to remember Azarenka for a Tennis Plays for Peace display match in the development to the US Open and hence dismissed an encouragement to play.