O2 Arena, London, England (GenevaLunch) - The final tennis matches of the A Group of the ATP Masters had the audience consulting their calculators to see who were the real winners. Roger Federer lost to Argentinia’s Juan Martin del Potro in three sets, 6-2, 6-7, 6-4 but it was just enough to ensure that Federer topped the group. Del Potro edged out Andy Murray by a single game in the final calculation, based on the difference in number of games won and lost in the three matches. Andy Murray won his match against Fernando Verdasco 6-4, 6-7, 7-6 but the close nature of the match later cost him a place in the semi- finals.

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