It was another bad day for the women's seeds at the Madrid Open - something that has become commonplace throughout the week.
Of the five seeds that made it through to Friday's quarter-finals, only number four Venus Williams will be present in the last four.
Williams, who was the only player in the top six to get past the third round following a series of upsets, beat the Australian eighth seed Samantha Stosur 6-3 6-3 and will now play Shahar Peer.
Israeli Peer beat 13th seed Li Na 6-4 3-6 6-4.
Regardless of what happens in her semi-final, Williams is projected to return to second place in the next world rankings for the first time since May 2003.
The other women's semi-final will be between unseeded duo Lucie Safarova and Aravane Rezai.
Czech Safarova, who dumped out Maria Sharapova in the first round, beat another Russian Nadia Petrova in a topsy-turvy match 6-1 1-6 6-4. Petrova, the 16th seed, had knocked out world number one Serena Williams in the previous round but could not follow that up with a win today.
Meanwhile, Rezai of France eliminated seventh seed Jelena Jankovic 7-5 6-4 in tonight's late game.