"I definitely got very frustrated in the second set. And it's something that I knew would happen but I didn't know exactly what she would do to make me frustrated," Osaka told Xinhua after the match.

"She was slicing and dicing and I was like, can I just hit a winner already? And she was like, no."

World No. 1 and local favorite Ashleigh Barty also wasted no time in reaching round three, dispatching Slovenia's Polona Hercog 6-1, 6-4.

Meanwhile, Denmark's Wozniacki kept her tournament alive by beating Ukraine's Dayana Yastremeska 7-5, 7-5.

Wozniacki, who won the 2018 Australian Open and plans on retiring from tennis after this year's event, accused her opponent of dirty tactics, buying time by calling for medical assistance.

"Obviously she tried to break my rhythm. And at 5-4 I don't think there is anything wrong," Wozniacki told reporters after the match.

"She was running just fine. So that's a trick that she's done before, and I knew it was coming."

While the drawcard names played in the relative shelter of the stadiums, outside it was a different story.

The wind was a constant factor, especially in the earlier hours of the day, with some handling the adverse conditions better than others.

After her 6-2, 6-4 win against the U.S.'s Catherine McNally, China's Zhang Shuai told Xinhua that she had found it particularly difficult to place her shots where she wanted.

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