Australian Open 2016: Women’s preview Rank Serena Williams (USA) Age: 34 World No.1 looking for fresh start having not competed since shattering defeat at U.S. Open. Persistent knee injury could be biggest threat to equalling Steffi Graf’s major record Simona Halep (ROM) 24 Needs consistency in Grand Slams after disappointing early exits in 2015 – swift defeat by Flavia Pennetta in U.S. Open semi-final prolonged wait for maiden major title Garbine Muguruza (ESP) 22 Aiming to develop attacking gameplay to build on impressive breakthrough season, including first Grand Slam final at Wimbledon and first Premier Mandatory title in China Maria Sharapova (RUS) 28 Staying healthy will be crucial if 2008 Australian champion is to mount sustained challenge for major titles this season – won last Grand Slam crown at Roland Garros in 2014 PLAYER RECORD 2015 win-loss 2015 titles Career titles Grand Slams Williams 53-3 5 69 21 Halep 49-15 3 11 0 Muguruza 38-18 1 2 0 Sharapova 39-9 2 35 5 Source: WTA Pictures: Getty Images Data correct as of Jan 7