London, England (CNN) -- The ATP Tour Finals in London are the climax of the tennis season with the best eight singles players and best eight doubles pairings battling it out for the prestigious titles.
CNN has gone behind the scenes at the O2 Arena to bring you a flavor of the unique atmosphere at the ATP Tour's showpiece event.
The sell-out crowds at the former Millenium Dome do not only get a chance to rub shoulders with the elite of world tennis, but also catch a glimpse of a glittering array of sports stars and celebrities.
Among those spotted this week include Argentina football legend Diego Maradona and Australian pop star Kyle Minogue.
The tournament finishes on Sunday with the singles and doubles finals.