From what I've seen so far between Ferrer and Tomic, it's the slowest HC match ever on the slowest HC ever. If the weather stays so humid for the entire tourney, I cannot see anyone stopping Nadal from moonballing his ass towards his first Miami title. I don't even want to imagine a match between him and Roger in those conditions. I don't know how Novak's body would handle this type of weather, but I think a remake of last's year final would be nice, but would favor Rafa.
A match between Nadal and Federer in these conditions? Think 6-3, 6-2 Nadal. Much like last year's semi-final.
If Federer wins Miami this year he will have played sublime tennis.