NEW YORK, Sept 6 (Reuters) - Order of play on the main show courts on the eighth day of the U.S. Open on Monday (play starts at 1500 GMT/11 AM ET unless stated, prefix number denotes seeding):
Arthur Ashe Stadium (1600 GMT/12 PM ET)
15-Maria Sakkari (Greece) v 3-Serena Williams (NYSE:WMB) (U.S.)
15-Felix Auger-Aliassime (Canada) v 2-Dominic Thiem (Austria)
Frances Tiafoe (U.S.) v 3-Daniil Medvedev (Russia)
16-Elise Mertens (Belgium) v 2-Sofia Kenin (U.S.)
Louis Armstrong Stadium
Vasek Pospisil (Canada) v 21-Alex de Minaur (Australia)
Alize Cornet (France) v Tsvetana Pironkova (Bulgaria)
6-Matteo Berrettini (Italy) v 10-Andrey Rublev (Russia)
Victoria Azarenka (Belarus) v 20-Karolina Muchova (Czech Republic)