KARLSRUHE, Germany - Tereza Martincova shocked fifth seed Daria Gavrilova with a 6-4, 7-6(3) straight sets win at the Luqui Moly Open Karlsruhe.
The Australian was 5-1 up in the second set, looking on course to force a decider, but the Czech battled back to wrap it up in two - and pin down an encounter with Jasmine Paolini of Italy tomorrow.
Top seed Tamara Zidansek retired during the second set against Ekaterine Gorgodze, with the Georgian 7-5, 3-4 up.
Zidansek had been 5-2 ahead in the opening set before Gorgodze won five games on the bounce, and despite a medical time-out in the second set was unable to continue.
Eighth seed Barbora Krejcikova was also dispatched, losing in straight sets 6-3, 6-4 to Bucharest finalist and Jurmala quarterfinalist Patricia Tig.
Sixth seed Irina-Camelia Begu fared better against Renata Voracova, dropping the first set 7-6(4), but winning the next two 6-4, 6-4 to secure her place in the Round of 16, while third seed Tatjana Maria beat Han Xinyun 6-1, 6-0.
Elsewhere, Elena-Gabriela Ruse beat Antonia Lottner 6-2, 6-2, and Tereza Mrdreza beat Richel Hogenkamp 6-1, 6-0.
More to follow.