Video: Rafael Nadal on CNN Talk Asia

"I'm not a machine, and like everybody I have better moments than others," Rafael Nadal told CNN in Shanghai.

"Tennis is a hard sport, a very, very tough mental sport because you play a lot of matches during the season and you have to be ready every week. So you need to be very focused all the time -- 100 percent physical and mental -- if you want to have chances to have a good result. Sometimes you feel you need to stop. I played every week for a long time and I forgot I had to stop for an injury."

"I never excepted be number two or Number one and have the chance to win Grand Slams. That's unbelievable for me, you know, I feel I'm a very lucky person because I work in tennis. My work is playing tennis and it's my hobby too, you know, so not everybody can work in one of his hobbies, so I feel lucky for that," he told CNN.

With six Grand Slam titles to his name already, the Majorcan believes he has a long future ahead of him in the game, despite his recent injury setback.

"I have seven years of my career right now and I am not finished, so I expect be here and hope be here for a long time."