Not that I'm questioning Bazooka's sources, but I would be extremely surprised if the surface isn't more similar to Monte-carlo than Rome.
You may very well be right, after all I know nothing of the inner courts which will hold the real tournament. However the humidity thing makes sense, the whole complex is adjacent to Manzanares river.
About altitude, well, I am not an expert but I think the effect is overrated. As a player I suck but never could find any difference between Madrid and the coast
Nadal career prediction: 6 RG, 2 Wimbledon, 1 Australian Open, 1 US Open
, 2 Master Cup, 20 Master Series
, 65 titles.
(Predicted before RG 2008 when he had 3xRG)
The inhabitants of the Balearic Islands are said to have been the inventors of slings, and to have managed them with surprising dexterity, owing to the manner of bringing up their children. The children were not allowed to have their food by their mothers till they had first struck it with their sling.
~Vegetius, De Re Militari, late 4th century
Nadal: the last Balearic Slinger, the ultimate product of natural selection. Feel the weight of the centuries in the Topspin from Hell!