MADRID: Players will step onto the untried blue clay courts of the ATP-WTA Madrid Masters from Sunday, with serious doubts and some hostility as preparations for the French Open are fine-tuned.

King of clay Rafael Nadal, who set records in his last two tournaments with an eighth straight trophy at Monte Carlo and a seventh from eight appearances in Barcelona, has been among the most outraged in the Spanish capital.

After training on the courts which are the marketing brainchild of the tournament's billionaire impresario Ion Tiriac, Nadal was even more upset than he had been before trying them out at the Caja Magica complex in the south of Madrid.

The world number two blamed the ATP for accepting the never-before-seen clay colour as the event prepared to get under way.

“I trained on it yesterday (Thursday) afternoon and I think it's a mistake – not by the organisation but by the ATP,” said the irate Spaniard on Friday at a sponsor event.

Nadal also told Spanish media: “Madrid is one of the best tournaments in the world and does not need this. It is played at altitude. That makes it different already. I appreciate the idea but it should have never been allowed.”

The controversial change was approved last year by outgoing ATP president Adam Helfant, who did not renew his contract after three years in the job.

The tournament leads into the Rome Masters starting May 14, which is the last major event before Roland Garros.

Novak Djokovic, the world number one, won both titles a year ago at the expense of Nadal.

The Serb will take the top seeding ahead of Nadal and third seed Roger Federer, with Frenchman Jo-Wilfried Tsonga replacing Andy Murray as fourth seed after the Briton pulled out on Friday with a back injury.

Djokovic has joined in with lesser criticism but much scepticism about the blue courts, while Federer, who is ATP Player Council president and usually a hard-core traditionalist, is taking a fine line as to his opinion.

“I find it sad to play on a surface the players don't accept,” said the Swiss. “It's said that a player like Rafa, at a tournament in his own country, has had to fight against a surface that he does not want to play on.”

There does not seem to be as much despair among the women about the new clay.

“It's a little different, the blue is unique,” said Maria Sharapova.

“Obviously that's what the tournament wants. To be unique, different. It's pretty cool.”