Rafael Nadal keen to end on a high

World number one Rafael Nadal has expressed his desire to win the season-ending ATP World Tour Finals in London next week.

The Spaniard returned from a knee injury earlier this year to claim the Grand Slam tournaments in France and the USA.

However, he has never claimed the World Tour Finals trophy - something that he is eager to put right this time around.

"The last tournament of the year is important. I have never had the chance to play very well in London. In 2010 I played well - the rest I played really bad. I want to try to change that," he told reporters.

"I was always motivated for this last part of the season, but I was not able to apply it well. I hope this year I can change that situation. I hope to play well here and then we'll see."

To date, Nadal has won 13 Grand Slam titles.