Australian Open Tennis day 4

All the action from day four at the Australian Tennis Open at Melbourne Park.

Top seed Victoria Azarenka plays Eleni Danilidou on Rod Laver Arena. Photo: Pat Scala

Top seed Victoria Azarenka plays Eleni Danilidou on Rod Laver Arena. Photo: Pat Scala

Bernard Tomic celebrates his first set against Daniel Brands. Photo: Sebastian Costanzo

Bernard Tomic celebrates his first set against Daniel Brands. Photo: Sebastian Costanzo

Victoria Azarenka victorious over Eleni Danilidou on Rod Laver Arena. Photo: Pat Scala

Victoria Azarenka victorious over Eleni Danilidou on Rod Laver Arena. Photo: Pat Scala

Roger Federer shirt swap on Rod Laver Arena. Photo: Joe Armao

Roger Federer shirt swap on Rod Laver Arena. Photo: Joe Armao

Roger Federer against Nikolay Davydenko on Rod Laver Arena. Photo: Joe Armao

Roger Federer against Nikolay Davydenko on Rod Laver Arena. Photo: Joe Armao

Serena Williams the victor against Garbine Muguruza. Photo: Pat Scala

Serena Williams the victor against Garbine Muguruza. Photo: Pat Scala

Serena Williams on her way to a win over Garbine Muguruza. Photo: Pat Scala

Serena Williams on her way to a win over Garbine Muguruza. Photo: Pat Scala

Serena Williams celebrates her win over Garbine Muguruza. Photo: Sebastian Costanzo

Serena Williams celebrates her win over Garbine Muguruza. Photo: Sebastian Costanzo

Andy Murray against Joao Sousa on Hisense Arena. Photo: Sebastian Costanzo

Andy Murray against Joao Sousa on Hisense Arena. Photo: Sebastian Costanzo

Andy Murray against Joao Sousa on Hisense Arena. Photo: Sebastian Costanzo

Andy Murray against Joao Sousa on Hisense Arena. Photo: Sebastian Costanzo

Bernard Tomic during his match against Daniel Brands on Rod Laver Arena. Photo: Pat Scala

Bernard Tomic during his match against Daniel Brands on Rod Laver Arena. Photo: Pat Scala

Bernard Tomic plays Daniel Brands on Rod Laver Arena. Photo: Pat Scala

Bernard Tomic plays Daniel Brands on Rod Laver Arena. Photo: Pat Scala