ARTHUR ASHE STADIUM (1600 GMT/12 PM ET)

1-Iga Swiatek (Poland) v Rebecca Peterson (Sweden)

Learner Tien (U.S.) v 10-Frances Tiafoe (U.S.)

Laura Siegemund (Germany) v 6-Coco Gauff (U.S.)

Alexandre Muller (France) v 2-Novak Djokovic (Serbia)

LOUIS ARMSTRONG STADIUM

18-Victoria Azarenka (Belarus) v Fiona Ferro (France)

Sloane Stephens (U.S.) v 19-Beatriz Haddad Maia (Brazil)

Steve Johnson (U.S.) v 9-Taylor Fritz (U.S.)

7-Stefanos Tsitsipas (Greece) v Milos Raonic (Canada)

Tatiana Prozorova (Russia) V Caroline Wozniacki (Denmark)