US Open results

Following are the results of the US Open tennis championships on Monday (prefix number denotes seeding):

Men's fourth round

Juan Martmn Del Potro, Argentina, bt 8-Dominic Thiem, Austria, 6-3, 3-2 - retired

3-Stan Wawrinka, Switzerland, bt Illya Marchenko, Ukraine, 6-4, 6-1, 6-7 (5-7), 6-3

6-Kei Nishikori, Japan, bt 21-Ivo Karlovic, Croatia, 6-3, 6-4, 7-6 (7-4)

Women's fourth round

1-Serena Williams, United States, bt Yaroslava Shvedova, Kazakhstan, 6-2, 6-3

5-Simona Halep, Romania, bt 11-Carla Suarez Navarro, Spain, 6-2, 7-5

10-Karolmna Pliskova, Czech Republic, bt 6-Venus Williams, United States, 4-6, 6-4, 7-6 (7-3)

Endit