MELBOURNE, Australia — Unseeded and floating dangerously in the draw, two-time Australian Open champion Victoria Azarenka took out No. 8-seeded Caroline Wozniacki 6-4, 6-2 on Thursday night to reach the third round at the first major of 2015. Azarenka's ranking slipped into the 40s due to a series of injuries that restricted her to nine tournaments in 2014, meaning she didn't have a seeding at the Australian Open despite winning the title here in 2012 and 2013.