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.

　　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.

　　No. 5 Robin Soderling became the highest seeded man eliminated so far when he was beaten 6-1, 6-4, 7-5 by 18-year-old Australian qualifier Bernard Tomic. The 158th-ranked Tomic served 13 aces and was never broken by the Swede, a two-time French Open runner-up who reached the quarterfinals at Wimbledon last year.

　　Sixth-seeded Francesca Schiavone, the 2010 French Open champion, lost to Tamira Paszek of Austria in three sets 3-6, 6-4, 11-9.

　　Federer's next opponent will be 18th-seeded Mikhail Youzhny, a Russian who ousted No. 16 Nicolas Almagro 4-6, 6-3, 7-6 (3), 6-3.

　　Nadal will face Del Potro, who beat Gilles Simon 7-6 (8), 7-6 ( 5), 7-5 and showed he is nearing top form after missing most of 2010 after surgery on his right wrist.

　　Williams, who is to play 2007 Wimbledon runner-up Marion Bartoli, the ninth-seeded Frenchwoman who beat Flavia Pennetta 5-7, 6-4, 9-7, is trying to become the first woman since Steffi Graf in 1991-93 to win three consecutive titles at the All England Club.

　　Sharapova, who hasn't reached the semifinals since 2006, will next face 20th-seeded Peng Shuai of China, who beat Melinda Czink of Hungary 6-2, 7-6 (5).

　　Wozniacki, still looking for her first Grand Slam title, swept Jarmila Gajdosova 6-3, 6-2 to make the fourth round for the third straight year. Wimbledon is the only major championship in which the Dane has not reached at least the quarterfinals.

　　Berdych, the sixth-seeded Czech, who had an easy win over Alex Bogmolov 6-2, 6-4, 6-3 from the United States, Berdych will next play 10th-seeded Mardy Fish, the last American man left in the tournament. He advanced when Robin Haase retired at 1-1 in the fourth set because of injuries. Fish was up two sets to one, 6-3, 6-7 (5), 6-2.

　　Ninth-seeded Gael Monfils lost to 93rd-ranked Polish qualifier Lukasz Kubot 6-3, 3-6, 6-3, 6-3. Kubot, who won three qualifying matches to get into the main draw, is the first Pole to reach the fourth round here since Wojtek Fibak in 1981.

　　Xavier Malisse, a Wimbledon semifinalist in 2002, ousted 11th- seeded Jurgen Melzer 7-6 (5), 6-3, 6-0, to earn a fourth-round meeting with Tomic.(本文由在线英语听力室整理编辑)