Roger Federer began his US Open preparation with a comprehensive 6-4, 6-4 defeat of Peter Gojowczyk at the Cincinnati Masters appearance since 2015. The contest was the first for the Swiss since losing to Kevin Anderson in five sets in the Wimbledon quarter-finals on July 11.

Thiem withdraws
Eighth seed Dominic Thiem was forced to withdraw without hitting a ball due to illness. The Austrian has played just one losing match last week in Toronto on the hardcourts since making a late switch from post-Wimbledon clay.