Djokovic has been dominant in 2011, but, after the two North American hard-court tune-up events, he does come to New York with a couple of question marks over his head. He won a very close match over Mardy Fish in the final in Montreal, but it was his performance in Cincy that was more concerning. In the semis against Gael Monfils, Djokovic went into the type of frustrated funk we used to see from him, but which he had banished from his brain so far this year. While he recovered in time to win that match in three, Djokovic had very little left, mentally or physically, for the final against Andy Murray, and he eventually retired with a shoulder problem. Are these shades of Nadal in Melbourne? Rafa came there after catching a virus, retired with a leg injury in the quarters, and never looked like the world's best player.
