Stan Wawrinka played two brilliant sets before Novak retired at the US Open. Clearly the Joker wasn't quite right, which is a shame after his great year....a left shoulder problem, impacting his backhand. Which of course accentuated the dominance of the great Wawrinka backhand. Nobody hits it harder says John McEnroe.
Now he faces Medvedev, the leading villain left in the draw after the departure of the Aussie vulture look alike Kyrgios. Should be a good contest.