Grand slam king Roger Federer kept up his sprint through the early rounds of the U.S. Open by steamrolling Steve Darcis of Belgium 6-1, 6-2, 6-1 to reach the third round of the year's final grand slam.

Second seed Federer, who took just 80 minutes to register victory over the 66th-ranked Darcis under the lights at Arthur Ashe Stadium, has lost just nine games in his first two matches at Flushing Meadows this week.

The 34-year-old Swiss, so comfortable in the spotlight of the night program, matched Serena Williams for most U.S. Open wins registered under the lights as he improved his record to 29-1.

"I've enjoyed myself so many times, so many years. It's wonderful that I can still experience it and play this well. It's great," Federer said in an on-court interview. "I hope this is not my last one, of course."

Federer, who has won an all-time leading 17 Grand Slam men's singles titles but none since the 2012 Wimbledon title, is set to next meet Philipp Kohlschreiber of Germany, a straight sets winner against Czech Lukas Rosol.

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In other men's results, fifth-seeded Swiss Stan Wawrinka outslugged promising South Korean teenager Chung Hyeon, but still needed three tiebreaks to sweat out a 7-6(2) 7-6(4) 7-6(6) second round decision.

"Today was a really tough day with the conditions," Wawrinka said. "You have to really be careful how you get ready for the match, what you eat, what you're going do and what you're going to take during the match."