Rafael Nadal: I can challenge at Wimbledon despite lowly ranking

Rafael Nadal insists he is refreshed and ready to challenge at Wimbledon despite heading to the third grand slam of the year in his lowest world ranking for 10 years.

Nadal has had a mixed few weeks, relinquishing his French Open crown before heading to Stuttgart, where he won his first title on grass since his triumph at the All England Club in 2010.

But despite crashing out of Queen's at the first hurdle and falling to world No.10, 29-year-old Nadal is optimistic about clinching a third title in SW19.

"I feel good," Nadal said in a press conference. "I won a tournament on grass after five years, a good moment for me and a special one.

"Let's see if I am able to compete well then at Wimbledon. I'm so happy to be here, you know. I'mh ealthy, that's the most important thing. Last year I was better, after 2012 and '13 [when] I couldn't play well here - too many problems with my knees.

"Losing or winning, it doesn't matter, but it is good to be healthy on the second most important surface in my career, without any doubt."

Nadal, who opens his Wimbledon campaign against fellow left-hander Thomaz Bellucci, believes his shock opening-round defeat against Alexandr Dolgopolov at Queen's may be a blessing in disguise.

He added: "I stayed in Queen's until Friday. So I rested for three days at home [but] I didn't practise. I came back here Tuesday morning and I have played well here on the practice courts.

"Playing on clay, obviously when I had the feeling I was playing at my best, the feeling is I have time for everything, and I have the possibility to play tactically. I had the possibility to play with different styles, to be aggressive, more defensive. That makes me feel under control almost all the time.

"On grass is a different story. On grass, the feeling is you have to be very focused all the games, every point. You cannot have two mistakes in a row, or three mistakes in a row with your serve because almost you lose a set.

"So it's a big difference and a good chance to go to the net more. It's a good chance to do different things that you are not doing very often on the tour. I'll try to have fun with that."