| Tennis News | Sunday January 20 2013 7:56
There's been an upset in the third round of the men's tournament at the Australian Open in Melbourne.
Sixth seeded Argentine Juan Martin del Potro is out after falling in five sets to Frenchman Jeremy Chardy.
But third seed Andy Murray has marched on with another straight sets win.
He says he hasn't played his best tennis yet, but has still moved into the fourth round.
In the women's, five-time champion Serena Williams and top seed Victoria Azarenka has joined Maria Kirilenko and Svetlana Kuznetsova in the fourth round.
Photo: Juan Martin del Potro (Getty Images)