Dopo che le prime 7 partite delle Finals erano terminate tutte in due set, la battaglia di servizi tra John Isner (ATP 10) e Marin Cilic (ATP 7) è stata vinta da quest'ultimo con il punteggio di 6-7 (2/7) 6-3 6-4 dopo 2h16' di gioco. Il croato ha fatto la differenza nella frazione decisiva grazie al break trovato nel terzo game, non lasciando più rientrare l'americano.
Nell'ultimo turno del Gruppo Kuerten Isner sfiderà il tedesco Alexander Zverev (5), mentre Cilic se la vedrà con l'ancora imbattuto Novak Djokovic (1). In virtù del primo set conquistato questa sera dallo statunitense, il serbo è già qualificato per le semifinali, ma non è tuttavia ancora sicuro di passare come primo del girone.
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