British number one Katie Boulter is into the quarter-finals of the Hong Kong Open after a straight-sets win over China's Wang Xiyu.

The 28-year-old, searching for her third title of the year, beat Wang 7-6 (9-7) 6-4 in two hours 15 minutes.

Second seed Boulter needed a tie-break to win a hard-fought first set before securing the win with a much more comfortable second set against the world number 100.

"That was quite the match. Wang is an incredible opponent and she never lets up. She is so talented and full credit to her," said Boulter after the win.

"She made me work very hard today and shes got a bright future ahead of her, that's for sure."

Boulter, ranked 29th in the world, won her maiden WTA 500 trophy in San Diego in March before defending her title at the Nottingham Open in June.

She will face either Varvara Gracheva or Anastasia Zakharova on Friday for a place in the semi-finals.