Novak Djokovic enjoyed a smooth passage into the US Open quarter-finals as he won in straight sets to end Croatian qualifier Borna Gojo's remarkable run.
Second seed Djokovic continued his bid for a record-equalling 24th major title with a 6-2 7-5 6-4 win in New York.
"I did well in the important moments and I'm pleased to get through in three sets," said three-time winner Djokovic.
The 36-year-old Serb will play ninth seed Taylor Fritz, who is one of three American men in the quarter-finals.
Fritz, 25, won 7-6 (7-2) 6-4 6-4 against Swiss qualifier Dominic Stricker, joining Frances Tiafoe and Ben Shelton in progressing on Sunday.