Second-seeded Petra Kvitova of the Czech Republic has moved into the quarterfinals of the New Haven Open with a 6-2, 6-4 victory over NCAA champion Nicole Gibbs.
The 2011 Wimbledon champion, the only Grand Slam winner in the New Haven field, is coming off a title in Montreal, her first ever in North America, and a run to the semifinals in Cincinnati.
Earlier, Caroline Wozniacki improved her record in New Haven to 19-0, beating Sofia Arvidsson 7-6 (4), 6-2.
Wozniacki is playing in the tournament for the fifth time and is the four-time defending champion.
She will play Dominika Cibulkova in the quarterfinals. Cibulkova beat Andrea Petkovic 6-4, 6-1.
Kvitova will face fellow Czech player Lucie Safarova, a 6-4, 6-0 winner over Jie Zheng 6-4, 6-0.