Day 5 at the Australian Open proved to be a good one for Iga Swiatek and Jannik Sinner, but teen sensation Joao Fonseca crashed out of the tournament in a gripping five-setter.
Day 5 as it happened: Sinner, Swiatek into third round, Fonseca ousted
Nick Kyrgios hints at retirement after Australian Open defeat (2:02)
Nick Kyrgios hints that he won't return to play singles at the Australian Open, yet insists he has "no regrets" after his first-round defeat. (2:02)