Wozniacki's New Haven run continues into semis
Wozniacki has struggled in 2012 by the standards of previous years, but needed just 70 minutes against the sixth seed to book her place in the semi-finals at Yale.
New Haven has been a happy hunting ground for Wozniacki in the past - the Dane has yet to lose in 20 singles matches here - and she will next face Maria Kirilenko for a final place.
Seventh seed Kirilenko was in equally clinical touch to blast past Olga Govortsova 6-1 6-2. Both players had seen their second-round opponents forced into abandonments.
Fourth seed Errani was comfortable in her 6-4 6-2 win over Bartoli, seeded fifth, while Kvitova, the second seed, was equally convincing with a 6-3 6-3 victory over eighth seed Safarova.