MELBOURNE, AUSTRALIA – JANUARY 22: (EDITORS NOTE: Image was created using the iPhone Snapseed application.) Serena Williams of the United States and Venus Williams of the United States in action in their fourth round doubles match against Roberta Vinci of Italy and Sara Errani of Italy during day nine of the 2013 Australian Open at Melbourne Park on January 22, 2013 in Melbourne, Australia. (Photo by Quinn Rooney/Getty Images)