Novak Djokovic, Coco Gauff roll to Australian Open's 4th round. Naomi Osaka retires due to injury and Jessica Pegula was upset in the third round.

Two-time Australian Open champion Naomi Osaka has stopped playing because of an injury after dropping the opening set of her third-round match against Belinda Bencic

After losing the first set 7-6 (3), two-time Australian Open champ Naomi Osaka retired from her third-round match against Belinda Bencic due to injury.

Danielle Collins has long been one of women's tennis' most fiery competitors. But after her tight second-round Australian Open win over Australian underdog Destanee Aiava, Collins showed she can bring it with the crowd,

Danielle Collins has gotten into a back-and-forth with a booing crowd at the Australian Open after eliminating a local player

Danielle Collins appeared to revel in playing the part of pantomime villain at the Australian Open on Thursday as she took down home favorite Destanee Aiava 7-6, 4-6, 6-2 in front of a raucous crowd.