Top seed Angelique Kerber survived a scare against American world number 70 Shelby Rogers to reach the Wimbledon last 16.
Germany's Kerber, 29, lost a tight first set before fighting back to win 4-6 7-6 (7-2) 6-4 in a thrilling battle on Court Two.
She will face Spain's 14th seed Garbine Muguruza in the fourth round on Monday.
Kerber will lose her world number one ranking if she does not reach the final.
Muguruza, a Wimbledon finalist in 2015, powered to a straightforward 6-2 6-2 victory over Romania's Sorana Cirstea.
Second seed Simona Halep could take top spot from Kerber by reaching the semi-finals, while Karolina Pliskova - despite her second-round exit - still has a chance of taking it.