Zhang Shuai and Wang Yafan lost in straight sets, while top seed Belinda Bencic continued her climb into the world top 10.
Bencic, the Swiss No 1, was ranked '913 or something' a year ago, but has since made significant progress.
"I felt good on the court," Bencic said. "I tried to play aggressively, tried to play my game, and it worked out well.
Bencic's victory marks her sixth win in a row, following her win at the Japan Open.
Author's summary: Bencic progresses in Hong Kong Tennis Open.