British number one Johanna Konta recovered from a slow start to reach the quarter-finals of the Shenzhen Open in China.
The world number 10 lost the first set to American Vania King, ranked 77th.
But she regained her composure and showed her dominance to beat her opponent 1-6 6-3 6-2.
Konta, who is the third seed at the event, will face either Kristyna Pliskova or qualifier Kai-Chen Chang in the last eight.