US OPEN—NEW YORK, NY, U.S.A.
Fourth-round results:
(2) Andy Murray DEFEATS (22) Grigor Dimitrov 61 62 62
(3) Stan Wawrinka DEFEATS Illya Marchenko 64 61 675 63
(6) Kei Nishikori DEFEATS (21) Ivo Karlovic 63 64 76(4)
Juan Martin del Potro DEFEATS (8) Dominic Thiem 63 32 (RET)
