Players must be consulted before experiments tennis like the use of blue clay courts, says world tennis number one Novak Djokovic.
Djokovic has become the latest victim of the heavily criticised courts at the Madrid Open in Spain, joining world number two Rafa Nadal in being eliminated from the event.
Djokovic, the defending champion was beaten 6-7 3-6 by fellow Serb Janko Tipsarevic in the quarter-finals.
Both Djokovic and Nadal have threatened not to return to the tournament unless there's a return to the traditional red clay courts.
Djokovic says ATP tour management's failed the players in allowing the slippery surface to be used.
The ATP allowed the surface to be used in order to make it easier for TV viewers to follow the yellow balls.
Forrmer ATP Tour chief executive Adam Helfant says he gave Madrid the clearance to use the blue surface only after receiving assurances the courts would play the same as a traditional clay surface.