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.

On Tuesday, Djokovic came out on top. While Alcaraz took the first set, Djokovic roared back and stifled Alcaraz in the next three sets, winning 4-6, 6-4, 6-3, 6-4. Djokovic moves on to the semifinals where he will face No. 2 seed Alexander Zverev on Friday.

An "emotional" Paula Badosa of Spain stunned the world number three American Coco Gauff 7-5, 6-4 on Rod Laver Arena and will face defending champion Aryna Sabalenka or Anastasia Pavlyuchenkova in the last four.