Novak Djokovic will resume his bid for a record 25th Grand Slam title when the fourth round of the Australian Open begins on Sunday at Melbourne Park, where defending women's champion Aryna Sabalenka takes on Russian teenager Mirra Andreeva.

When Carlos Alcaraz is on court for a training session, perhaps working on his newly revamped service motion, he's doing so to buttress a game already good enough to claim four Grand Slam titles.

Carlos Alcaraz became the third youngest player to reach an impressive Grand Slam milestone when he won his third-round clash at the Australian Open on Friday.