In the pre-quarters, Swiatek will take on last season's Wimbledon champion Elena Rybakina of Kazakhstan, who defeated the previous year's runners-up Danielle Collins 6-2, 5-7, 6-2 in their third-round match-up
The nine-time champion, Novak Djokovic persisted through his pain to oust the Frenchman 6-1, 6-7(5), 6-2, 6-0 despite battling with his bandaged left leg.
Eighth-seeded Saina Mirza and Anna Danilina defeated the unseeded American-Hungarian team of Dalma Galfi and Bernarda Pera 6-2, 7-5 in 1 hour, and 17 minutes.
The three-time Melbourne semifinalist was in command for the entirety of the one-hour, 32-minute matchup with Hijikata. With his aggressive ball-striking, he consistently outmatched the World No. 169, hitting 30 winners on the Rod Laver Arena.
Gauff won the match by a comfortable margin of 6-4, 7-6(4). She will be facing Bernarda Pera in her next, with the winner of the clash advancing to the pre-quarters stage of the tournament.
The sixth seed rallied from a set down to win on Margaret Court Arena with scores of 3-6, 3-6, 6-3, 6-2, 6-2, keeping him alive in his quest to top his quarterfinal performance from Melbourne last year.
The 21-year-old Italian took full advantage of his opportunity on one of three roofed courts where he raced into the third round defeating Etcheverry 6-3, 6-2, 6-2 in a match that lasted for one hour, 44 minutes.