Second seed Magdalena Rybarikova has crashed out of the second round of the Nottingham Open after a defeat by Mona Barthel.
The German world No.117 saw off the Slovakian 6-3 1-6 7-5 to take her place in the quarter-finals.
There was, however, no such problem for third seed Naomi Osaka of Japan, who coasted past Czech player Denisa Allertova 6-3 6-2.
Romanian fifth seed Mihaela Buzarnescu is also safely into the last eight after she defeated Irina Falconi 6-3 5-7 6-3.
Top seed Ashleigh Barty will face Yingying Duan for a place in the quarter-finals on Thursday after compatriot Samantha Stosur takes on Brit Katie Boulter.
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