Madison Keys upset two-time Wimbledon champion Petra Kvitova after Madison Brengle knocked out Coco Vandeweghe on Saturday. And that means there are four Americans in the final 16 at the Australian Open.
The Williams sisters advanced to the third round at the Australian Open, with top-ranked Serena fending off three set points before going on a 10-game roll to beat Vera Zvonareva 7-5, 6-0, and Venus beating fellow American Lauren Davis in straight sets.
Sorry, Serena and Venus, but with 110 career titles, including 25 majors, between you, it's just a given that the world should keep an eye on you two. So, in that spirit, here are eight women not named Williams to watch at the 2015 Australian Open.