ATP Finals - Friday Schedule: Novak Djokovic vs Cilic, Zverev vs Isner

On Friday afternoon at the ATP Finals in London Alexander Zverev and John Isner will face off for the sixth time in career. The German leads the head to head meeting 4-1. Novak Djokovic leads the head to head against Marin Cilic 16-2. The Croatian only defeated the Serb at 2016 Paris Masters quarter-finals and this year’s Queen’s championship clash on grass saving match points.

Roger Federer hits elegant volley against Kevin Anderson (VIDEO)