Sept 4 (Reuters) - Order of play on the main show courts on the seventh day of the U.S. Open on Sunday (play starts at 1500 GMT/11 AM ET unless stated, prefix number denotes seeding): ARTHUR ASHE STADIUM (1600 GMT/12 PM ET) 5-Elina Svitolina (Ukraine) v 12-Simona Halep (Romania) 24-Dan Evans (Britain) v 2-Daniil Medvedev (Russia) Frances Tiafoe (U.S.) v 12-Felix Auger-Aliassime (Canada) 8-Barbora Krejcikova (Czech Republic) v 9-Garbine Muguruza (Spain) LOUIS ARMSTRONG STADIUM Botic van de Zandschulp (Netherlands) v 11-Diego Schwartzman (Argentina) 16-Angelique Kerber (Germany) v Leylah Fernandez (Canada) 15-Elise Mertens (Belgium) v 2-Aryna Sabalenka (Belarus)