Only one week left to qualify for London, and there are still four spots remaining to be filled. Rafael Nadal's decision to end his season in order to have surgery opens the door for one more player to slide into the fold at London. Who will it be?

Andy Murray, who has now won 18 of his last 20 matches and two consecutive titles, is in pole position at the moment. The Scot can guarantee his trip to London with a quarterfinal result in Paris, while Kei Nishikori will become the first Asian to compete at the World Tour Finals with a semifinal run.

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Tomas Berdych, a former Paris champion, can also guarantee his spot with a semifinal run, while David Ferrer, also a former champion and currently clinging to the last qualification slot, will need a final run to guarantee himself a slot.

Milos Raonic, who has struggled mightily of late, and Grigor Dimitrov, are currently on the outside looking in. Each would need a title run to qualify for London, and Dimitrov needs to reach at least the last four in Paris to have any chance of reaching the World Tour Finals.

Here is a breakdown of the current Race to London Standings below: