Back to the blue clay/red clay controversy for a moment :
I found that the blue clay made for much better TV images...
But apparently, it also has to do with the time of day, and camera positioning.
I watched part of the FED-Berloq match on Tennis channel HD, and the ball was almost invisible, sometimes it looked
like to players just flailing around with their rackets.
Then I watched some of the Berdych-Kubot match, and it was much better, ball was clearly visible..