Novak Djokovic one step away from calendar Grand Slam after Alexander Zverev win

Novak Djokovic roars after beating Alexander Zverev. Picture: John Minchillo/AP

Novak Djokovic avenged his Olympic loss to Alexander Zverev over five sets to move to within one victory of a historic US Open title.

Defeat by Zverev in the semi-finals in Tokyo had denied Djokovic the chance to become the first man to complete the Golden Slam of all four major titles and Olympic singles gold, but the main carrot of the calendar Grand Slam and a 21st slam title remained within reach.