Rafael Nadal believes that tennis needs some changes so that players have a less aggressive game and the mental strength becomes crucial. 'I do not have a specific idea in my mind, but at some point, you should care about the serve', Nadal told Socrates Magazin when asked about rules you should change in tennis.

'Players are getting bigger and the serve becomes even faster. If in the next years you will not find a good solution, I am afraid that in the future sports will be only about power. And it could be dangerous.' Nadal thinks that abolishing the second serve could be okay: 'It would not be a silly idea.

You just have to try and see if this rule is right. You may introduce new rules in little tournaments.' Nadal also asked for another change: 'I support a ranking based on two-year results and not 52 weeks. This is the best way to protect players from injuries.

I have been thinking about it for years.' The 32-year-old believes the current tennis era, in terms of game style, is not the best one compared to the past: 'Ilie Nastase was fantastic. I liked the tennis of that era because they played thinking more and it was less about the bum.

There was a little bit more magic. Talent and tactics were more important than now. That lacks in tennis. On clay-courts you can still build points, but it became almost impossible on grass and hard. It's becoming too fast now.' ALSO READ: Maria Sharapova reveals how tennis keeps her motivated