PARIS — Roger Federer is gaining momentum in his bid to win that elusive French Open title.

The top-ranked Swiss beat Mario Ancic 6-3, 6-4, 6-2 today to reach the fourth round at Roland Garros for the sixth time. It's the only Grand Slam tournament he has yet to win.

Federer struggled at times in the first two rounds, but quickly seized control against Ancic. Federer won all but 15 of the 71 points on his serve and was broken only once. He totaled 22 winners and had only 15 unforced errors.

Ancic is the last player to beat Federer at Wimbledon — in 2002 — but has lost their past five meetings.