Teenage American Learner Tien has pulled off the sensation of the Australian Open, taking out former finalist Daniil Medvedev in an early-hours Melbourne epic.
American star Coco Gauff is hoping history repeats when she meets Canadian Leylah Fernandez, following her recent success in the United Cup.
Polish star Iga Swiatek and Britain's Emma Raducanu will square off in a headline third-round clash at the Australian Open.