Gauff gets past Jovic and into US Open quarters, van de Zandschulp and Khachanov also advance

VIDEO SHOWS: HIGHLIGHTS FROM US OPEN DAY NINE, WINS BY COCO GAUFF AND KAREN KHACHANOV, MATCH POINT FROM WIN BY BOTIC VAN DE ZANDSCHULP RESENDING WITH COMPLETE SCRIPT SHOWS: NEW YORK CITY, NEW YORK,

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