Stosur showed inconsistency on serve throughout the match, committing two double faults and winning only 40 percent of her service points.

Zhang later remarked that her familiarity with Stosor's style of play helped her win the match.

"I think we know each other so much, we play doubles together, we [are] training together. Even two days ago before the draw [was] out, we practiced. So I think we know each other very well," she remarked.

Zhang added that she found it easy to anticipate her opponent's moves.

"Sometimes before she hit, I already got a feeling (where she was sending the ball). I try to don't think [about] anything, just focus every point," Zhang said.

Zhang will face lucky loser Polana Herzog, who replaced world no. 7 and US Open Champion Naomi Osaka in the second round after she dropped out earlier today due to illness.

The late match on Sunday delivered a shock, as world No. 9 Sloane Stephens lost a hard-fought two hour thirty-three minute match against Estonian qualifier Anett Kontaveit, 4-6, 7-5, 6-4.

Stephens was shaky out of the gate, but some solid ground strokes powered her past the Estonian in the first set. The US Open champion couldn't maintain that momentum, and Kontaveit repeatedly fought her to deuce over the course of the next two sets, eventually condemning Stephens to a first round knockout.

In doubles action, Chinese wildcards Duan Ying Ying and Wang Yafan took out Belinda Bencic/ Alize Cornet in a rollercoaster ride of a 0-6, 7-6(2), 10-6 match. They will face Ashleigh Barty and Coco Vandeweghe, who received a bye into round two.

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