Rybakina outclassed one of the finest in the world during the quarterfinals by 7-5, 6-1 in a match that lasted an hour and 35 minutes long, levelling her head-to-head record against Iga to 6-6.
Keys continued her winning run at the Australian Open, extending her unbeaten run to 10 matches, outclassing the former US Open and Wimbledon finalist 6-3, 6-3 to end her hopes of any further run in the tournament.
The encounter between both last year's quarterfinalists was a highly anticipated one but it was Pegula who prevailed over the 2021 Roland Garros champion after a match that lasted one hour and 41 minutes
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
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.