But Osaka quickly turned things around in a big way. After being held to 30 in the sixth game of the first set, she went on to win every remaining game of the match.

"I think getting into the rhythm [was crucial in the first set]. It seemed like she was the type that would use my pace [to her advantage], especially on the forehand. I just tried not to give her too much," Osaka said after the match.

The Japanese now faces a quarterfinal against US Open champion Bianca Andreescu, after the Canadian made short work of qualifier Jennifer Brady, defeating the American 6-1, 6-3.

Already on a 15-match winning streak, Andreescu continued her good form in the first set, breaking Brady three times on the way to sealing things up with ease.

Although Brady held serve to 3-3 in the second set, Andreescu kept finding the depth of the court and closed out the match in a little over one hour.

In the men's draw, world number 19 John Isner fired off 21 on his way to a hard-fought 7-6 (3), 7-5 win over British qualifier Daniel Evans in just under two hours.

The two players each held their service games out to 6-6 in the opener, with both Isner and Evans holding to love at least once on the way to the tiebreak, when the American would take the first breaks of the match to grab the opener.

Neither side gave much in the second set either, holding to 5-5 before Isner got a crucial break to go one up and avoid another tiebreak.

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