Serbia's Novak Djokovic reacts after losing his match against USA's Reilly Opelka at the Brisbane International, in Brisbane, Australia, Friday, Jan. 3, 2025. (AP Photo/Pat Hoelscher)

Serbia's Novak Djokovic plays a forehand against USA's Reilly Opelka during their match at the Brisbane International, in Brisbane, Australia, Friday, Jan. 3, 2025. (AP Photo/Pat Hoelscher)

Serbia's Novak Djokovic reacts during his match against France's Gael Monfils at the Brisbane International in Brisbane, Australia, Thursday, Jan. 2, 2025. (AP Photo/Pat Hoelscher)

Serbia's Novak Djokovic plays a forehand to USA's Reilly Opelka during their match at the Brisbane International in Brisbane, Australia, Friday, Jan. 3, 2025. (AP Photo/Pat Hoelscher)