Boris Becker, coach of Novak Djokovic, can’t be blamed for having a little too much time on his hands. His star pupil has played just 10 sets in this year’s US Open, receiving a walkover in the second round, and retirements in both the third round and quarterfinals.
The world No. 1 has spent less than six-and-a-half on court to get to the quarterfinals.