Sports Illustrated's Extra Mustard website has picked several WTA stars among its 60 must-follow athletes on the social networking app Instagram.

Fifteen-time Grand Slam champion Serena Williams came in at No.2, two-time Grand Slam winner Victoria Azarenka at No.19, recent Australian Open semifinalist Sloane Stephens at No.28 and rising British star Laura Robson at No.42. NBA star Kevin Durant was ranked No.1.

Launched in October 2010, Instagram allows users to share their lives with friends through a series of pictures. It currently has 100 million registered users, with 90 million of them actively monthly and 40 million photos shared per day. It is compatible with Flickr, Facebook and Twitter and is available for free in the Apple App Store and Google Play store.