No.21 seed Andreas Seppi progresses to the last 16 in Melbourne for the first time after beating Croatian 12th seed Marin Cilic in five sets 6-7 6-3 2-6 6-4 6-2 . Former France Open champion suffers shock third -round exit from Argentine Open . Unseeded Jeremy Chardy from U.S. beats sixth -seed Argentine in nearly four sets . Sloane Stephens , Andy Murray safely through to fourth round with straight-set wins . Serena Williams and Sloane Stephens into fourth round in women 's draw .
Former France Open champion suffers shock third -round exit from Argentine Open . Unseeded Jeremy Chardy from U.S. beats sixth -seed Argentine in nearly four sets . Sloane Stephens , Andy Murray safely through to fourth round with straight-set wins . Serena Williams and Sloane Stephens into fourth round in women 's draw .