Federer battles through 'worrying moments' to reach quarter-finals.

ROGER FEDERER admitted his fourthround opponent Julien Benneteau caused him a few "worrying" moments as the world number one battled to a straight-sets win at the French Open yesterday.

Benneteau, the world number 55, time and again thrilled the partisan crowd on Philippe Chatrier Court with some bullying groundstrokes, but ultimately the errors outweighed the winners as the class of the Swiss maestro told.

Federer posted a workmanlike 6-4 7-5 7-5 triumph in an entertaining encounter, but admitted facing a fired-up Benneteau on his home turf was taxing.

"It might be tough but I think that the (French) public was fair," said Federer. "Once again, they were here when they were needed for Benneteau. He broke me twice when I was serving for the set in the first, so the pressure was going up. That's when Benneteau started playing well, perhaps worrying me a little, but I managed to play well afterwards."

Next up for Federer is a quarter-final encounter with Chile's Fernando Gonzalez, who breezed into the last eight with a routine 7-6 (7/4) 6-3 6-1 win over unseeded American Robby Ginepri.