WIMBLEDON, England, June 25 -- Roger Federer, Rafael Nadal and Serena Williams all won in straight sets Saturday to move into the last 16 at the Wimbledon Championship.

Six-time champion Federer beat David Nalbandian 6-4, 6-2, 6-4 to move closer to equaling the record of seven Wimbledon singles titles held by Pete Sampras and 1880s player Willie Renshaw.

Two-time winner and defending champion Rafael Nadal committed only three unforced errors in a 7-6 (6), 7-6 (5), 6-0 victory over Gilles Muller, a 92nd-ranked wild card from Luxembourg.

Rafael Nadal of Spain returns the ball during his third round match of men's singles against Gilles Muller of Luxembourg in 2011 Wimbledon Tennis Championships in London, Britain, June 25, 2011. Nadal won 3-0.

Nadal hit 36 winners and never lost serve against Muller, the last player other than Federer to beat the Spaniard at Wimbledon, in the second round in 2005. It's the first time Nadal has advanced to the round of 16 here without losing a set.

Williams, chasing a third straight title and fifth overall in her comeback from nearly a year out with serious health problems, served 10 aces in beating 26th-seeded Maria Kirilenko 6-3, 6-2.

Another former champion, 2004 winner Maria Sharapova, also reached the fourth round, upsetting Klara Zakopalova of the Czech Republic 6-2, 6-3.

Other winners included top-ranked woman player Caroline Wozniacki, former U.S. Open champion Juan Martin del Potro and last year's runner-up Tomas Berdych.

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