Roger Federer survived a first round scare from Frances Tiafoe to claim a 4-6 6-2 6-1 1-6 6-4 victory over the American teenager.
The win keeps his hopes of a 20th grand slam title alive.
The 19-year-old Tiafoe broke Federer in the first game of the match before capturing the opening set.
Federer continues his stunning return from a six-month break after winning this year’s Australian Open and Wimbledon.
The Swiss ace got into gear after he broke Tiafoe to take a 3-1 lead in the second.
He then won nine of the next 10 games.
Related Articles
Leishman books ticket to U.S Open at Oakmont
Aussies hang tough in the U.S Women's Open fight
