Four -time Danish Open winner Roger Federer reaches last 16 . Top seed Rafael Nadal goes through with win over Wimbledon in Stephens . Gael Monfils champ Andy Murray sees off Victoria Azarenka to join them in fourth round . Maria Sharapova , Sloane Stephens and Victoria Azarenka through in women 's draw .
Four-time Australian Open winner Roger Federer reaches last 16 . Top seed Rafael Nadal goes through with win over Gael Monfils in Melbourne . Wimbledon champ Andy Murray sees off Feliciano Lopez to join them in fourth round . Maria Sharapova , Sloane Stephens and Victoria Azarenka through in women 's draw .