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.

Coco Gauff has endorsed a revolutionary idea from Novak Djokovic to make professional tennis more entertaining for fans. Both players are currently in the midst of their Australian Open campaigns, and while out in Melbourne the Serbian raised eyebrows by voicing a new idea.

The number of Americans in the field has dwindled, but Coco Gauff continues to get the job done on the court. The No. 3 seed dropped her first set against Belinda Bencic, but roared back to conquer the second and third sets, winning 5-7, 6-2, 6-1 in two hours and 26 minutes.