Spain's Rafael Nadal reacts during his fourth-round win at Wimbledon on Monday.

Switzerland's Roger Federer returns a shot in his victory over Lleyton Hewitt on Monday.

Wimbledon, England ? Five-time champion Roger Federer swept Lleyton Hewitt – the last man to win the title before him – 7-6 (7), 6-2, 6-4 on Centre Court to extend his winning streak on grass to 63 matches and 38 in a row at the All England Club. Federer, who served 21 aces, has now beaten his Australian rival in 12 consecutive matches.

Federer next will face the last player to beat him on grass and at Wimbledon – Croatian Mario Ancic, who won in the first round in 2002. Ancic came from two sets down Monday to beat Fernando Verdasco, 3-6, 4-6, 6-3, 6-4, 13-11. The final set alone lasted 1 hour, 35 minutes.

“I completely underestimated him back in 2002,” Federer said. “I was a little shellshocked and didn’t know what happened to me. What it taught me was not to underestimate any opponent.”

Second-ranked Rafael Nadal also advanced to the quarterfinals.

The Spaniard beat Mikhail Youzhny of Russia, 6-3, 6-3, 6-1, on Court 1 on Monday.

During the second game of the match, Nadal had an injury scare after stumbling.

Extra strapping was attached to Nadal’s right leg by his trainer, but he didn’t appear to be troubled as he completed the victory in 2 hours, 10 minutes.

In women’s action, second-seeded Jelena Jankovic was ousted in straight sets in the fourth round by Tamarine Tanasugarn, leaving the women’s draw without its top three ranked players.

Jankovic’s 6-3, 6-2 loss means that none of the top three women reached the quarterfinals – the first time that’s happened at Wimbledon and the second time at any Grand Slam tournament in the Open era, following the 1997 Australian Open. No. 1 Ana Ivanovic and No. 3 Maria Sharapova were upset last week.

The Williams sisters, meanwhile, moved closer to another Wimbledon final with back-to-back victories on Court 2 – nicknamed the “Graveyard of Champions” for its history of upsets.

The women’s draw also lost its fourth-seeded player when Svetlana Kuznetsova, the 2004 U.S. Open champion, fell, 6-4, 1-6, 7-5, to 19-year-old Agnieszka Radwanska of Poland.

Defending champion Venus Williams beat Russian teenager Alisa Kleybanova, 6-3, 6-4, while two-time winner Serena Williams downed Bethanie Mattek – the only other American left in the men’s or women’s draw – 6-3, 6-3.