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How can tennis star Roger Federer have won only 54% of the points he played, but been the best player in the world?

Jeff Sackmann, the tennis stats brain behind tennisabstract.com, explains to Tim Harford how probability works in the sport.

Presenter: Tim Harford
Producer: Debbie Richford
Series producer: Tom Colls
Production co-ordinator: Brenda Brown
Sound Mix: Nigel Appleton
Editor: Richard Vadon