http://sports.yahoo.com/news/novak-djokovic--rafael-nadal-are-a
players-that-detest-madrid-open-s-new-blue-clay-
courts.html;_ylt=AmdRijJ9Bv_sndk_SkpCkk44v7YF
The "blue courts" are made of the same crushed brick as normal clay but
treated
to remove the iron oxide that provides the typical orange hue. The brick
is
dyed blue, and apparently something in the process causes different spin
and
bounce than usual.
