They reached the quarterfinal of the fourth and final Grand Slam of the year and were defeated by Taiwan’s WangXinyu and China’s Hsieh Su-wei with a score of 7-6, 3-6, 6-4.
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While Pegula has had a below-par singles category outing in the mega-event, Gauff is being on an impressive run.
The former was surprisingly knocked out from the round of 16 after losing to fellow American Madison Keys in straight sets with a score of 6-1, 6-3.
On the other hand, Gauff qualified for the final of the US Open for the first time in her career after beating Czech Republic’s Karolina Muchova in the last four with a score of 6-4, 7-5.
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She will face the newly-crowned world number one Belarus’ Aryna Sabalenka in the final of the competition on Saturday.
The 25-year-old defeated Keys in the semifinal in a stunning manner despite not winning a game in the first set with a score of 0-6, 7-6, 7-6.