The 106th edition of the Australian Open is underway at Melbourne Park, and fan favourite Roger Federer is chasing his 20th career Grand Slam. It's the first Grand Slam of the Year and with 17 Australians in the draw, local interest is high. 2017's women's champion Serena Williams isn't defending her crown. Williams's withdrawal has thrown the women's draw wide open, with Australia holding high hopes for the Australian Ashleigh Barty.