Second seed Petra Martic was eliminated from the Prague Open in a straight-sets defeat to Kristyna Pliskova, but Elise Mertens booked her place in the quarter-finals.
World number 69 Pliskova struck 28 winners to 13 unforced errors on home soil as she secured a 6-1 7-5 victory in one hour and 22 minutes.
The Czech wrapped up the opening set in just 21 minutes and Martic paid the price for passing up two opportunities to hold serve at 5-5 in the second.
Pliskova, a runner-up in Prague in 2017, made Martic pay by serving out the match and setting up a meeting with Ana Bogdan, who got a walkover after Lesia Tsurenko withdrew prior to their match.
Mertens ensured Simona Halep is not the only seed remaining in the draw by defeating Camila Giorgi 6-4 6-2, while, in matches held over from Tuesday, Laura Siegemund and Tamara Zidansek wasted little time in wrapping up three-set victories over Mayar Sherif and Katerina Siniakova respectively.
It was not a day off for Halep, though. The Romanian joined forces with Barbora Strycova for a doubles match against Veronika Kudermetova and Anastasia Pavlyuchenkova that ended in a 6-3 3-6 10-8 loss.