I am a little confused about red clay courts. Does anyone know what the real red clay courts in South America and Europe are made from? Is it really red clay or is it something else? My friend from Brazil who played at a club for many years in Brazil says it is really red clay. I have heard that they use red crushed bricks for the red clay at the French Open. If my friend it right about the courts being real red clay, then I would surely like to built one because they have plenty of red clay that is used at the sprint car track in our town. In fact, it is donated to the track for free by a local company. Also, what is the difference between red clay and green clay. I heard that red clay plays slower than green clay. Why do they have so many red clay courts in Europe and South America, but hardly any in the United States. We seem to have only green clay courts in the states. Last, does anyone know of any good red clay or green clay courts in central California. I personally would rather play on red clay. Thanks for helping sort this out.