Blue clay used at Madrid Masters this year has been banned by the ATP for all 2013 World Tour events . Rafael Nadal and Novak Djokovic voiced disapproval after losing matches on surface . Score: 6
Blue clay used at Madrid Masters this year has been banned by the ATP for all 2013 World Tour events . Rafael Nadal and Novak Djokovic voiced disapproval after losing matches on surface . Surface pioneered by former Romanian tennis star and businessman Ion Tiriac .