India, Jan. 9 -- Top-seeded Elina Svitolina again relied on her "fighting spirit" Thursday, beating wild-card entry Katie Boulter 7-5, 6-4 to reach the quarterfinals of the WTA tournament in Auckland, New Zealand.

Both players struggled on serve in windy conditions on center court. There were nine service breaks in the match, which the number 13-ranked Svitolina clinched on her third match point. "Katie is a great fighter so I was expecting a tough match," Svitolina said. "She can strike the ball very well, as she did today, and it was not an easy match for us with the wind swirling around."

Svitolina dropped her serve in the third game, immediately broke back but was broken again in the ninth. She won some exceptional clutch points to ...