Serena through to last 16 as fresh controversy hits US Open

Andrey Rublev (RUS x10) bt Salvatore Caruso (ITA) 6-0, 6-4, 6-0

Vasek Pospisil (CAN) bt Roberto Bautista (ESP x8) 7-5, 2-6, 4-6, 6-3, 6-2

Dominic Thiem (AUT x2) bt Marin Cilic (CRO x31)