^^ Interesting about Djoko ...
Haven't come across comments by any others who have played, but Federer apparently isn't worried about the surface, at least not yet -Federer has no fear of Big Blue in Madrid
MADRID — Blue clay courts at the Madrid Masters hold no fears for former champion Roger Federer, with the confident Swiss insisting on Sunday that he will be ready for any conditions when he begins play in the second round.
Federer, the third seed and 2009 champion, who beat Rafael Nadal to lift that title, has had two days of training on the experimental -- and controversial -- blue courts laid down at the Caja Magica.
Game day and practice sessions are two completely different situations, but the Swiss is not worried about what he might find in the heat of battle on the unorthodox surface.
"I've played on it for two days, but not on centre court," said Federer, back on the ATP Tour after more than five weeks of holiday rest and training.
"It feels a bit different than regular clay. Maybe it's the visual aspect. It's been cool and rainy so far here. It will be interesting to see how it is in hot and nice weather.
"There is still some waiting to do and matches are quite a bit different than practices. I have to wait for my match to come around to give a proper opinion."http://www.google.com/hostednews/afp/article/ALeqM5j-V-Xg_VWpObH8TUQsc5-YwDO84Q?docId=CNG.96c23b7cb0ccfca98f279ebc9a06febf.5a1