Osaka's withdrawal handed Estonian eighth seed Kontaveit an automatic place in the final on Sunday. It takes a few days to not feel it, and then I just have to strengthen.
She reached the semis here past year and is back again, so even if she was the biggest longshot on the board of the top contenders at the beginning of the tournament, this is no fluke.
The match went the full three sets before Kvitova emerged with a 7-6 (3), 3-6, 6-1 win.
"I try not panic anymore, because that costs energy", she said. Sure, I didn't win Indian Wells [this season], but I still thought I did pretty good there and in Miami, and then I'm here now.
"I never want to withdraw, especially in a semi-final, so I am sad", she said.
Kvitova claimed a break in the opening game of the second set as well, before Kontaveit was able to obtain her first service break of the encounter in the very next game.
Naomi Osaka had to come from the brink to stay alive in the Stuttgart event this weekend.
However, the Estonian, who received a walkover into the final after top seed Naomi Osaka pulled out from their last four clash due to injury, missed her chances and allowed Kvitova to come back.
Osaka can not lose her No. 1 spot in Stuttgart, but she will be looking to keep a healthy points lead over world No. 3 Petra Kvitova, who also won her quarterfinal.
In Barcelona, two-time champion Kei Nishikori won a clay slugfest with Roberto Carballes Baena 6-4, 7-5 on Friday to move into the semifinals for a fourth time. "We practiced a bit together before the tournament, which was fun", Kvitova said. The first game of the decider set the ladies continued to bash the ball over the court with Azarenka many times clipping the line to score. "I was hitting my forehand heavy, which I think you need to do on clay".
At the Istanbul Cup, Petra Martic needed three sets and two tie-breaks to remain the only seed left in the draw, defeating the risky Kristina Mladenovic 7-6 (7-4) 4-6 7-6 (7-2).