Five-time champion Roger Federer breezed into the US Open second round with a routine victory over Japan's Yoshihito Nishioka at Flushing Meadows.
Federer, 37, needed one hour and 52 minutes to win 6-2 6-2 6-4 in the night session on Arthur Ashe Stadium on Tuesday.
The Swiss great hit 56 winners compared to just 17 from his 177th-ranked opponent, the BBC reports.
The 20-time Grand Slam winner will play France's Benoit Paire in the second round in New York.
"I'm very happy with how I played tonight. It is particularly tough for us Europeans because we don't get this type of humidity. You are sweating so much you don't know what has hit you," Federer said.
"It is tough so you are happy when you survive a day like this."