Williams sisters, Radwanska progress in Melbourne

Agnieszka Radwanska and the Williams sisters were comfortable day four winners at the Australian Open.

Of the trio, Serena Williams was the most tested - saving set points on her way to a 7-5 6-0 win over former world number two Vera Zvonareva on Rod Laver Arena.

Zvonareva, now ranked 203rd, has experienced long lay-offs to injury and illness in...

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