Djokovic saved two set points and defeated Alex Michelsen in straight sets.
Just three days after their epic final in Beijing, Alcaraz and Sinner moved through in Shanghai.
Gauff rallied past Paula Badosa to become the youngest Beijing finalist since 2010.
The ITF announces major changes for Davis Cup and Billie Jean King Cup starting in 2025.
The crafty Czech claimed her third consecutive win over Sabalenka.
Coco Gauff rallied past qualifier Yuliia Starodubtseva 2-6, 6-2, 6-2 advancing to her second straight Beijing semifinal.
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