Ashleigh Barty and Casey Dellacqua upended No.2 seeds Andrea Hlavackova and Lucie Hradecka, while No.3 seeds Nadia Petrova and Katarina Srebotnik also were eliminated.
WTA Staff

LONDON, England - The plethora of upsets that has stricken many of the draws at Wimbledon continued in women's doubles quarterfinal play on Wednesday, with No.2 seeds Andrea Hlavackova and Lucie Hradecka and No.3 seeds Nadia Petrova and Katarina Srebotnik among the victims.

In fact, this is the first time in the Open Era that no Top 6 seeds have reached the Wimbledon doubles semis and the first time that has happened at any Grand Slam since the 2009 Australian Open.

Twelfth-seeded Australians Ashleigh Barty and Casey Dellacqua edged Hlavackova and Hradecka, 26 62 64, getting revenge for a first round Fed Cup loss to the Czechs in February.

In so doing, Barty and Dellacqua improved to 8-0 on grass - having won Birmingham a few weeks ago. No Birmingham-winning duo has gone on to win Wimbledon that same season, which Barty and Dellacqua would accomplish if they can do one match better than they did at their first Grand Slam - a runner-up showing at January's Australian Open.

Next up for Barty and Dellacqua are the new on-paper favorites, No.7 seeds Anna-Lena Groenefeld and Kveta Peschke. The German-Czech pairing were 76(2) 63 winners over Petrova and Srebotnik. The only team yet to drop a set this fortnight, Groenefeld and Peschke are having by far their best outing together at a Grand Slam. Interestingly enough, Peschke picked up her lone Grand Slam title alongside Srebotnik at Wimbledon two years ago.

Also setting up an encounter in Friday's semifinals were eighth-seeded Hsieh Su-Wei and Peng Shuai and Shuko Aoyama and Chanelle Scheepers.

Hsieh and Peng beat Jelena Jankovic and Mirjana Lucic-Baroni, 64 75, to make their second Grand Slam semifinal - having previously done so at the 2009 French Open. First-time pairing Aoyama and Scheepers edged 16th-seeded Julia Goerges and Barbora Zahlavova Strycova, 76(6) 57 64, in a match that lasted over two and a half hours. The Japanese-South African duo has been extended to three sets in all four of their matches, but nevertheless, Scheepers is the first South African into a doubles Grand Slam semifinal since Mariaan de Swardt was a runner-up here in 1999.

Groenefeld and Peschke took the court a second time Wednesday, but this time on opposite sides of the court, as Peschke and Marcin Matkowski got the best of Alexander Peya and Groenefeld in third round mixed doubles play. Barty also is into the mixed doubles quarterfinals alongside John Peers. The last player to win both the Wimbledon women's doubles and mixed doubles titles in the same year was Cara Black in 2004.