MILAN — The Williams sisters want to defend their Olympic doubles title in London next summer.

Serena Williams said Friday that she and sister Venus are eager to go for their third Olympic gold together after victories at the 2000 Sydney and 2008 Beijing Games.

First up, the sisters will play an exhibition match in Milan on Saturday against Italian duo Francesca Schiavone and Flavia Pennetta.

“We’re the defending champion and we want to defend our title and I don’t see why we wouldn’t,” Serena said of the London Games. The sisters were unable to defend their title in Athens 2004 after Serena injured her knee.