Kvitova, the fifth seed, rode a roller coaster in the 62-minute opening set which featured 17 break points between the error-prone pair with a dozen of those saved.
Kvitova celebrates her victory over Li Na. PIC/AFP
“I hope this is good preparation for the US Open,” said Kvitova. “I had some good matches here and hope to continue. But every tournament is different and every player is tough, so we’ll see.
“It’s great to have a good result in North America before the Open.”