Serena Williams makes winning start at Aus Open 2017
USA's Serena Williams began her campaign at the Australian Open 2017 with a straight-set win over Switzerland's Belinda Bencic in the tournament's opening round on Tuesday. World number three Poland's Agnieszka Radwanska also progressed to the second round of the tournament after a three-set win over world rank 64 Bulgaria's Tsvetana Pironkova.