Khachanov d. Tien

Khachanov beat Tien 7-5, 4-6, 6-7(6), 6-1, 6-4 in the fourth round at the U.S. Open - New York. Khachanov won 166 of 323 points (51%). Khachanov hit 9 aces to 8 and won 73% of points behind the first serve (77/105) against 71% for Tien. Khachanov converted 9 of 12 break points and saved 9 of 14 faced; Tien converted 5 of 14. Tien double-faulted 8 times. Winners to unforced errors: 48–56 for Khachanov, 55–55 for Tien. The match was played on hard in United States.