British number one Katie Boulter came through a tricky encounter with Ukrainian lucky loser Daria Snigur in straight sets to reach the Nottingham Open quarter-finals.
Boulter, ranked 126 in the world, beat 21-year-old Snigur 7-5 6-3.
"It was an absolute battle, I'm really proud of myself," said Boulter, 26.
She holds the top British women's ranking for the first time in her career after reaching the semi-finals of the Surbiton Trophy last week.
Despite losing to Belgian Yanina Wickmayer in the last four of that grass-court tournament, Boulter jumped ahead of Emma Raducanu who has been hampered by injuries and seen her ranking plummet.