In an interview with Britain's Daily Mail(Put clay on the O2 courts and give my knees a break!), Nadal told Stuart Fraser:
"I believe that it’s not fair that a player like me really never played on a surface that was a little bit more favourable. I always played on the worst surface possible for me.
"If it’s indoor at the 02, then great, but you can build a different type of surface there. It is a fantastic place to organise a World Tour Finals. The atmosphere is just amazing and I am very happy it is there. I enjoy it every time I have had the chance to be there, but we can play on clay there too." -Rafael Nadal
According to Chris Chase from USA Today, he said Nadal shouldn't be to complaining about O2 courts are not on clay.
Rafael Nadal shouldn't be whining about not having clay courts at the ATP World Tour Finals
"I believe that it’s not fair that a player like me really never played on a surface that was a little bit more favourable. I always played on the worst surface possible for me.
"If it’s indoor at the 02, then great, but you can build a different type of surface there. It is a fantastic place to organise a World Tour Finals. The atmosphere is just amazing and I am very happy it is there. I enjoy it every time I have had the chance to be there, but we can play on clay there too." -Rafael Nadal
According to Chris Chase from USA Today, he said Nadal shouldn't be to complaining about O2 courts are not on clay.
Rafael Nadal shouldn't be whining about not having clay courts at the ATP World Tour Finals