U.S. Open 2015 Day 4SI Staff|Share on FacebookShare on XAdd us as a preferred sourceU.S. Open 2015 Day 4U.S. Open 2015 Day 4 Stan WawrinkaElsa/Getty Images Johanna KontaMatthew Stockman/Getty Images Victoria AzarenkaTIMOTHY A. CLARY/AFP/Getty Images Simona HalepClive Brunskill/Getty Images Jack SockAl Bello/Getty Images Stan WawrinkaElsa/Getty Images Jack SockAl Bello/Getty Images Jack SockAl Bello/Getty Images Andy MurrayClive Brunskill/Getty Images Adrian MannarinoClive Brunskill/Getty Images Simona HalepClive Brunskill/Getty ImagesAdd us as a preferred source on GoogleFollowPublished Sep 3, 2015 | Modified Sep 3, 2015SI STAFFShare on FacebookShare on XHome/Tennis