Straight-sets wins for Simona Halep, and Venus Williams during the day, with Serena Williams dominating Vania King to open the evening. Zhang Shuai reached her first US Open third round with an upset of her doubles partner, 2011 champion Samantha Stosur.
Anastasia Pavlyuchenkova prevailed in a three-hour affair over 2015 quarterfinalist Kristina Mladenovic – winning a decisive tiebreak to end a 94-minute third set that ran longer than the complete matches won by Halep, Venus, Zhang, Serena, Karolina Pliskova, Timea Babos, Johanna Larsson, Ana Konjuh, Carla Suarez Navarro, Yaroslava Shvedova and Elena Vesnina.
