Venue: Flushing Meadows, New York Dates: 31 August-13 September
Coverage: Live radio and text commentary on every Andy Murray match plus selected matches.
Fifth seed Stan Wawrinka beat American Donald Young to set up a possible US Open quarter-final against Andy Murray.
The French Open champion from Switzerland, 30, won 6-1 1-6 6-3 6-4 on Arthur Ashe Stadium.
Women's second seed Simona Halep, 23, came from a set down to beat Sabine Lisicki 6-7 (6-8) 7-5 6-2.
Murray faces South African Kevin Anderson later on Monday, while fellow Briton Johanna Konta meets Petra Kvitova in the women's fourth round.