Roger Federer eased into the second round of the French Open with a 6-4 6-4 6-3 victory over American Sam Querrey.

Querrey provided the world number one with a decent workout, but Federer was always in control and next faces Albert Montanes or Kristof Vliegen.

"It's always difficult in the first round at Grand Slams," said Federer. "I'm relieved and looking forward to the second round."

Federer took a while to get going, letting an early lead slip in the first set, but he was rarely threatened by 6ft 6in Querrey and took the match in one hour 35 minutes.