US Open—Flushing Meadows, New York
Fourth-round results:
(23) Stan Wawrinka Defeats (1) Novak Djokovic 64 75 21 ret.
(3) Roger Federer Defeats (15) David Goffin 62 62 60
(5) Daniil Medvedev Defeats (Q) Dominik Koepfer 36 63 62 76(2)
Grigor Dimitrov Defeats Alex de Minaur 75 63 64
