World number one Caroline Wozniacki to reach the semi-finals at Indian Wells when Victoria Azarenka resign because a hip injury after three games.
Azarenka, from Belarus eighth seed, suffered the injury while trying to play a forehand in game three.
After a 14-minute time limit injury to finish the game before he was persuaded by his coach to pull out.
Juan Martin del Potro will meet Rafael Nadal or Ivo Karlovic in the semis after Tommy Robredo men retreated.
Robredo out of the quarterfinals because of left abductor muscle tension, Spanish 25th seed said: “We did an MRI tonight and we see the results.
“Doctors here say not to play We have been delayed as much as possible because we call our doctors in Spain to see how they feel about .. Now the decision made.”
Maria Sharapova took Shuai Peng in the final of the women’s quarter-finals on Thursday, before the men of seed Nadal face Karlovic.
Wozniacki has done enough to ensure he will remain number one ranking until the end of next week’s tournament in Miami, but he was clearly uncomfortable with the way the quarter-final win.
“It’s always difficult to play good friends,” says Dane. “But when I see him get hurt, I thought: ‘Oh no, it’s not the way we want to play’ I wish him all the best and hope he can play in Miami next week ..”
Wozniacki and Azarenka has launched a Japanese flag before the quarterfinals in the memory of those who died in the quake and tsunami in the country.
“It was just devastating to see what is happening in Japan,” said Wozniacki. “We just wanted to show that we think about them over there.”
Wozniacki and Azarenka paid tribute to the Japanese people before their match