Rafael Nadal admitted his passion for tennis had dipped before his shocking group stage exit from the ATP World Tour Finals in London.

The Spaniard gave himself time off to prepare for the season-ending tournament at the O2 Arena but crashed out Thursday night following a defeat to Jo-Wilfried Tsonga.

The Frenchman triumphed 7-6 (7-2) 4-6 6-3, two days after Nadal had been utterly outclassed by Roger Federer on the indoor hard court. Nadal's solitary win in the group stage was in his opening match against Mardy Fish.

I am going to practice and I am going to do everything in my hands to be perfect for the beginning of 2012.

- Rafael Nadal

"Probably I had a little bit less passion for the game probably because I was a little bit more tired than usual," Nadal reflected, according to Sky Sports. "I am going to practice and I am going to do everything in my hands to be perfect for the beginning of 2012."

Nadal retained his French Open title in 2011, tieing Bjorn Borg's record six championships at Roland Garros.

But he relinquished his No. 1 ranking amid defeats to Novak Djokovic in the Wimbledon and US Open finals before a stuttering end to the campaign.

"This end of the year wasn't easy for me," he said. "That's hard to accept. But at the same time that's given me a little bit more of a goal for the beginning of 2012. My desire is there. My motivation I hope is the same. I will do it. If it's not enough, it's not going to be enough. But I will be satisfied with myself."

The 26-year old's season is not entirely finished though. Despite his fatigue, he will lead Spain's challenge in the Davis Cup Final against Argentina next month in Seville.

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