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Jabeur was roared on by a Tunisian contingent on Court Philippe-Chatrier as Gauff dropped the opening set, but the American grew in confidence in the second and stamped her authority in the third to reach the semis for the second time.
Fourth seeds Coco Gauff and Jannik Sinner, along with home hope Alex de Minaur and world number 11 Barbora Krejcikova progressed.
All four players in the group can reach the semifinals.
The Czech Republic player stuned Tunisia's Ons Jabeur in straight sets in the final.
The World No 1 defeated his childhood friend Holger Rune of Denmark in the quarterfinals.
The Tunisian won 6-1, 6-2 to storm into the third round.
Haddad Maia is the first Brazilian woman since Maria Bueno in 1968 to reach a Slam semifinal and the first female player from her country to book a last four spot at Roland Garros in the Open Era.
Tunisian trailblazer Jabeur is pursuing her maiden Grand Slam.
Sakkari battled past world No. 3 Pegula 7-6(6) 7-6(4) to record her first win over a top-five opponent this year.
'I struggled to win my first WTA title. It took me time. So I believe this will take me time,' said the Tunisian.
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