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FILE - This is a July 8, 2007, file photo showing Switzerland's Roger Federer making a return against Rafael Nadal during the Men's Singles final on the Centre Court at Wimbledon. Set aside, for the moment, Federer's athleticism and artistry, his sturdiness and strokes. Start instead with the pure numbers, simply because they serve as an objective, and overwhelming measure of his supremacy on a tennis court. (AP Photo/Anja Niedringhaus, File)