LONDON, England - In an event that featured a monumental upset in the quarterfinals, it seems fitting there would be two more surprises in Friday's semifinals, leading to the first match-up of unseeded doubles finalists at Wimbledon since 1975.

Elena Vesnina and Vera Zvonareva, playing their first event together since 2008, showed that their stunning defeat of the Williams sisters on Wednesday was no fluke, as they eased past fourth-seeded Gisela Dulko and Flavia Pennetta, 63 61. Vesnina is seeking her fourth Sony Ericsson WTA Tour doubles title and Zvonareva her sixth (she has one major among her doubles titles - the 2006 US Open), although it would be their first as a duo.

Read about the Russians' huge upset of Serena and Venus!

Zvonareva, who will play in Saturday's singles final against Serena Williams before taking the court again later in the day for doubles, is looking to capture the singles and doubles titles at the same event for the second time, having done so at Indian Wells in 2009.

Standing in the Russians' way will be another team seeking their first title together, Vania King and Yaroslava Shvedova, who topped No.5 seeds Liezel Huber and Bethanie Mattek-Sands, 64 64. Making the result all the more surprising is the fact that in the only previous match-up between the teams, just a few weeks ago in the semifinals of Birmingham, King and Shvedova managed just four games.

This was not the first significant upset King and Shvedova pulled off this fortnight, as they knocked off No.3 seeds Nadia Petrova and Samantha Stosur in the third round and No.6 seeds Kveta Peschke and Katarina Srebotnik in the quarters. King is seeking her 11th career Tour doubles title and Shvedova her second, but it would be the first major for both of them.

Friday's loss was especially bitter for Huber, in that a victory would have allowed her to take back the No.1 doubles ranking she relinquished to the Williamses after Roland Garros. She has spent 134 weeks at No.1 in her career, third-most in history.

Meanwhile, Leander Paes and Cara Black and Wesley Moodie and Lisa Raymond won semifinal matches to advance to the mixed doubles final. Paes and Black will be shooting for their third major together.