With Federer being King of Grass and Nadal being King of Clay, I've seen people trying to push Djokovic as the King of Hard Courts recently. But with only one USO to his name so far, he really needs to win this 3 or 4 more times if he is going to make that moniker stick. If he has 7 or 8 AOs and then 3 or 4 USO, along with all his Masters HC titles, he could have a good case for it.
So from that point of view, Djokovic really needs to win this USO. Does he want to be King of HC or King of Down Under?