Rafael Nadal.

THE ASSOCIATED PRESS

LONDON -- Rafael Nadal will return to Queen's this year after he was unable to defend his title at the grass-court tournament in 2009.

In 2008, Nadal was the first man to win at the French Open, Queen's Club and Wimbledon in the same year, but his persistent knee problems prevented him from defending his titles on grass at Queen's and Wimbledon last year.

The Spaniard said Thursday there was now more motivation for him this year.

"I always look forward to coming to England to play at the Queen's Club and Wimbledon but this year there is even more motivation because I could not defend my titles last year," Nadal said.

Two years ago, Nadal followed victory at Queen's with his first triumph at Wimbledon, ending Roger Federer's dominance at the All England Club in an epic five-set final. But injury meant he could not return for the grass-court season a year later.

"No one was more disappointed than me that I couldn't play because I love those tournaments," Nadal said. "Queen's is a big, important tournament ... and it was an amazing feeling to win it in 2008 and then to fulfil my dream by winning Wimbledon.

"To not defend my Wimbledon title last year was one of the toughest decisions in my career, but this is a new year and now I have the chance to go back to England and to compete on the grass again."

Nadal's injury problems in the middle of 2009 signalled his slide from the No. 1 ranking. After winning the 2009 Australian Open, Nadal lost a match at the French Open for the first time when he fell to Robin Soderling in the fourth round.

Nadal's last appearance on court was when he retired, with more knee problems, in his quarter-final match against Andy Murray at the Australian Open in January.

The 23-year-old left-hander is set to return to action at this week's Masters tournament in Indian Wells, California.

U.S. Open champion Juan Martin del Potro has also announced his intention to play at Queen's. The traditional Wimbledon warm-up event is scheduled for June 7-13.