Former champion Maria Sharapova defeated unseeded American Lauren Davis 6-1, 6-7(5), 6-0 at the Australian Open today and set up a fourth round match with rising Swiss talent Belinda Bencic.12th seed Bencic was the first player into the round of 16 after fighting back from a set down to overhaul Ukrainian Kateryna Bondarenko 4-6, 6-2, 6-4 in the earlier match.Bencic also became the first Swiss woman to reach the fourth round at Melbourne Park since Martina Hingis and Patty Schnyder in 2007.