Defending US Open champion Naomi Osaka took on rising star Coco Gauff in the third round on Saturday. Meanwhile Taylor Townsend has yet another impressive performance as she makes her way to the fourth round. » Subscribe to USA TODAY Sports: https://bit.ly/2L0ktE1 » USA TODAY delivers current local and national news, sports, entertainment,  finance, technology, and more through award-winning journalism, photos, videos and VR.