Two-time Wimbledon tennis champion Venus Williams of the United States blasted her way into her sixth consecutive appearance in the London tournament's quarterfinals by dominating Vera Zvonareva of Russia 6-1, 6-3.

The 59-minute victory Monday came after an early rain delay and gave the fourth-seeded Venus a measure of revenge against the 18-year-old Russian who beat her at the recent French Open. Venus next meets fifth-seeded countrywoman Lindsay Davenport, who beat No. 13 Shinobu Asagoe of Japan 6-4, 6-1.

Venus's top-seeded younger sister, Serena Williams, knocked another of the record five Russians out of the fourth round as she beat No. 15 Elena Dementieva 6-2, 6-2. She'll play fellow-American Jennifer Capriati, who defeated Russian No. 10 Anastasia Myskina 6-2, 6-3.

Meanwhile, second-seeded Kim Clijsters of Belgium put friendship aside as she defeated her doubles partner, Ai Sugiyama of Japan, 6-3, 6-2.

In men's action, big-serving Mark Phillippoussis of Australia upset world No. 1 Andre Agassi of the United States in a five-set marathon. Philippoussis served up a Wimbledon record-tying 46 aces on the way to the 6-3, 2-6, 6-7, 6-3, 6-4 win over the second-seeded Agassi.

However, fifth-seeded American Andy Roddick advanced to the quarterfinals with a four-set win (6-4, 3-6, 6-3, 6-2) over No. 12 Paradorn Srichaphan of Thailand.

Fourth-seeded Roger Federer of Switzerland beat Feliciano Lopez of Spain in straight sets (7-6, 6-4, 6-4), while eighth-seeded Sjeng Schalken of the Netherlands was also a straight-sets winner over No. 9 Rainer Schuettler of Germany (7-5, 6-4, 7-5). Alexander Popp of Germany needed four sets to eliminate Olivier Rochus of Belgium (5-7, 6-3, 6-4, 6-2), while Jonas Bjorkman of Sweden topped Max Mirnyi of Belarus in another four set match (6-4, 3-6, 6-3, 7-6).