American Andy Roddick has booked his place at the World Tour Finals with four weeks of the season remaining, the ATP said on Tuesday.

The world number seven will join Roger Federer, Rafael Nadal, Andy Murray, Novak Djokovic and Juan Martin del Potro at the end-of season tournament to be held in London from Nov. 22-29.

"The reaction I received from fans after the Wimbledon final was something I will never forget," the 27-year-old Roddick told the ATP website.

"I've always had great support in London and I'm looking forward to being back there in November."

Roddick, who reached the semi-finals in 2003 and 2004, has qualified for the season-ending event seven years in a row.

Two places are still up for grabs with Russian Nikolay Davydenko and Spaniard Fernando Verdasco leading the chase.