From his first performance, one has to surmise Mr. Djokovic's mind/body is not really in this tournament. Almost any other player in this tournament than mentally fried Mr. Tsonga would have likely bageled or breadsticked Nole in the first set. He hasn't been this bad since Mr. Federer iced him in Cincinnati. It's obvious that he would rather be back home tending his father. Haters that don't understand that don't understand the Serbian culture.
Even with all this against him, Nole managed to lift his level just enough to get past Jo in the first set and cruise through the second.
If he plays anywhere near this level against Mr. Murray, Novak will be well beaten by Andy, and for that matter, Mr. Berdych later.
If he somehow manages to put everything to one side, then it should be a good match.
I'm having a difficult time trying to get the HTH stats on indoor matches between these two, but from memory I believe they have very few or none. It really doesn't matter. It will come down to whose head is into this match and tournament more.
They played one indoor match in Madrid, 2006. Nole won in 3 sets.