Serena Williams did her part earlier in the day by dumping unseeded fellow American Lisa Raymond, 6-2, 6-0, in only 40 minutes. But Venus had to go the distance against top seed Martina Hingis of Switzerland to create the sibling semifinal.

In the first meeting between the two teenage rivals this season, Venus Williams pulled out a 6-3, 4-6, 6-4 victory over the top-ranked player to reach her first Wimbledon semifinal.

Thursday's match will be the fifth meeting between the Williams sisters and second at a Grand Slam. Venus prevailed, 7-6, 6-1, in their first meeting during the second round at the 1998 Australian Open and has won three of four meetings overall.

Lindsay Davenport looks to move one step closer to successfully defending her title, but she will have to get past former No. 1 player Monica Seles in an all-American clash later today.

The Davenport-Seles winner will meet Australian teenager Jelena Dokic in the semifinals.

One year after reaching her first career Grand Slam quarterfinal here, the 17-year-old Dokic moved into her first semifinal at a major by beating Magui Serna of Spain, 6-3, 6-2.

Davenport, seeded second, moved into the quarterfinals on Monday with a 6-3, 6-3 victory over fellow American Jennifer Capriati.

After battling back problems in recent weeks and coming back from a 0-3 third-set deficit to win her second-round match, Davenport has looked stronger in her last two matches as she has not lost a set.

Seles, the sixth seed, continued her quest for the only Grand Slam title she has never won by beating ninth seed Arantxa Sanchez-Vicario of Spain, 6-3, 6-4, on Monday. A winner of nine Grand Slam titles, Seles' best showing at the All-England Club was runner-up in 1992.

Davenport is 5-2 lifetime against Seles, having won the last five meetings.

In doubles, Martina Navratilova moved a step closer to a record-tying 20th Wimbledon title as she teamed with South Africa's Mariaan de Swardt to dismiss Sanchez-Vicario and Amelie Mauresmo of France, 6-1, 6-1, to reach the quarterfinals.

The 43-year-old Navratilova lost in the first round of mixed doubles on Saturday. She is looking to tie Billie Jean King's mark for the most Wimbledon titles.

The men's quarterfinals will take place on Wednesday as Pete Sampras looks to move one step closer to a record 13th Grand Slam title.

Sampras, the top seed and six-time champion, will face fellow American Jan-Michael Gambill.

Andre Agassi is the third American looking to secure a semifinal berth. The 1992 champion and last year's runner-up, Agassi will face 10th seed Mark Philippoussis of Australia.

In other quarterfinal matchups, No. 12 Patrick Rafter of Australia will attempt to reach his second straight Wimbledon semifinal when he takes on unseeded Alexander Popp of Germany.

Also, two unseeded players will square off when Byron Black of Zimbabwe goes against Belarussian qualifier Vladimir Voltchkov.