Both Pegula and Gauff are still chasing their first Grand Slam title and are among the extended group of contenders in Melbourne.
Pegula recently caused a stir with a clear two-set win against world number one Iga Swiatek in the United Cup.
So far, the 28-year-old has ended in the quarterfinals at the latest in the majors.
Gauff, ten years younger than her compatriot, was in a Grand Slam final for the first time at the French Open in 2022, but was clearly defeated by Swiatek.
1st round: Pegula gives up only one game – highlights
Australian Open
Baby boom in women’s tennis continues: comebacks instead of career ends
UPDATE YESTERDAY AT 3:48 PM