Novak Djokovic and Aryna Sabalenka will step up their bids for tennis history at the Australian Open on Wednesday, where Carlos Alcaraz, Coco Gauff and Naomi Osaka will also be in second-round action.Sabalenka is hunting down a rare hat-trick of consecutive Australian Open wins, a feat last achieved 26 years ago by Martina Hingis and only matched by four other women in history.