Top seed and British number one Johanna Konta beat Ukraine's Kateryna Kozlova in three sets to progress to the quarter-finals at the Nottingham Open.
Twice runner-up Konta, 30, won 6-2 1-6 6-3 and will face Belgian Alison Van Uytvanck for a place in the last four.
Katie Boulter overcame fellow Briton Heather Watson 7-6 (7-4) 6-3 to reach her third WTA Tour quarter-final.
The 24-year-old will meet the winner of the all-American battle between Lauren Davis and second seed Alison Riske.
Boulter is on the comeback trail after her career was stalled by a serious back injury.
"I love this court, I have played some really good matches on it and I am really proud of myself, I thought it was a really good match," she said.
Konta broke world number 159 Kozlova's serve twice in a comfortable first set.
Kozlova dominated the second set but failed to convert three break points early in the third and it was Konta who made the decisive breakthrough to win.
"It was an incredibly tough match," said Konta. "She is playing well on the surface and has beaten some really good players here.
"I knew it was not going to be a straightforward match and it proved so."
Konta, who split from her coach Dimitri Zavialoff over the weekend, was given a bye through the first round before comfortably beating the Netherlands' Lesley Pattinama Kerkhove in straight sets on Tuesday.
The Briton lost in both the 2017 and 2018 finals, with the former preceding Konta's run to the semi-finals at Wimbledon.
Meanwhile, in the men's challenger event British number one Dan Evans continues the defence of his title against Denis Kudla on Friday.