Top seed Kristina Mladenovic is out of the Samsung Open after retiring in her match with German qualifier Tamara Korpatsch due to a back injury.
Mladenovic was already a break down in the second set, having the lost the first, and called it a day with the score 7-6 (7-5) 3-2 in Korpatsch's favour.
"I don't like to win like this, that she retired," Korpatsch said.
"I don't know if she was already injured at the beginning, or if it happened in the match."
Fourth and fifth seeds Anett Kontaveit and Svetlana Kuznetsova were both eliminated too despite winning the opening sets in their respective contests.
Qualifier Vera Lapko beat Kontaveit 3-6 6-4 6-3, while Mona Barthel recorded a 4-6 6-3 6-4 victory over Kuznetsova.
