Five-time champion Roger Federer is through to the third round of the US Open after a routine 6-3 6-2 6-1 victory over Carlos Berlocq of Argentina.
Federer needed just over an hour and a half to seal his passage against the World No 48, who has never beaten a top 10 player.
Swiss great Federer was notably impressive on serve, winning 75 per cent of the points on his first delivery and 67 per cent on his second, and sending down six aces.
He also hit 37 winners and converted seven of his 13 break point chances but also made 25 unforced errors, a failing which could lead him into difficulties against stronger opposition.
Federer is seeded an unusually lowly seventh in New York after a slight decline in his form and will face old rival Rafael Nadal in the quarter-finals, if they both make it that far.
Federer not thinking about Nadal
"I am well aware of the draw," said Federer. "But, at the moment, I am clearly focusing on round by round and it would be a big mistake if I was thinking too much about Rafa.
"I would love a match with Rafa but, for that to happen, I have to keep playing well and keep winning.
"Right now it's about winning for me, trying to gain confidence and enjoy myself. I hope I can progress, we'll see how it goes.
"Today was one of those matches I expect myself to win, if possible in straight sets, and gain confidence in the process.
"All those things happened, so I'm pleased about it."
Federer, whose 17 Grand Slam victories is the most in history, will face Adrian Mannarino of France in round three.