The 2012 Sony Ericsson Open enters its sixth day of play on Sunday in Miami. The competition is already full of surprises, as Venus Williams made a strong return to action on Saturday and upset the No. 3-ranked women's singles player in the world, Petra Kvitova. She'll be back in action in the fourth round on Sunday, facing fellow wild card Aleksandra Wozniak. The No. 1 women's player, Victoria Azarenka, will face wild card Heather Watson in the fourth round.
Rafael Nadal will also be in action on Sunday, facing Radek Stepanek. John Isner will be taking on Florian Mayer in the fourth round after defeating Nikolay Davydenko on Saturday. Andy Murray will have a fourth-round match as well, as he goes up against Milos Raonic.
You can catch Sunday's action on the Tennis Channel or stream the matches live on the tournament's official website.