Andy Roddick has secured his place at the ATP World Tour Finals in London next month.

Despite being forced out of the Shanghai ATP Masters 100 last week due to a knee injury, the American has won enough points to guarantee his spot at the 02 Arena.

Roddick becomes the sixth singles qualifier for the season's climax - held from November 22-29 - after retiring in his second-round clash with Stanislas Wawrinka in China.

And he is now relishing a return to London.

"The reaction I received from fans after the Wimbledon final was something I will never forget," he said.

"I've always had great support in London and I'm looking forward to being back there in November. I'm sure it will be a fantastic event."