Defending champion Aryna Sabalenka held on for a tough second-round win at the Australian Open on Wednesday, but last year's finalist Zheng Qinwen became the first Top 10 seed to fall this week.

Zheng Qinwen is out of the Australian Open after a shock defeat to Germany’s Laura Siegemund. Zheng, the No. 5 seed and last year’s beaten finalist, lost 7-6(3), 6-3 after her serve unraveled in the fourth game of the second set.

MELBOURNE, Australia (AP) — Distracted by a time penalty and unable to counteract No. 97-ranked Laura Siegemund's aggressive approach, Zheng Qinwen's loss in the second round Wednesday fell a long way short of last year's run to the Australian Open final.

Coco Gauff and two-time defending champion Aryna Sabalenka have moved closer to another semifinal showdown at the Australian Open.

While there have been plenty of surprises in the men’s bracket so far, most of the top women have progressed through the draw without an issue.

Two-time defending champion Aryna Sabalenka of Belarus owns the longest Australian Open women's singles winning streak in more than a decade after advancing out of the third round on Friday in Melbourne.