Simona Halep became the first player in the top half of the draw to reach the quarterfinals after a straight set win over Carla Suárez Navarro.
18-year-old Ana Konjuh took out World No.4 Agnieszka Radwanska in straight sets to score the biggest win of her career and reach the quarterfinals of the US Open.
Karolina Pliskova came from match point down to win a dramatic fourth-round shoot-out against two-time champion Venus Williams at the US Open on Monday.
Number 2 seed Angelique Kerber defeated Petra Kvitova in two sets to reach the quarter finals
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