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A close-up of the tennis shoes of Switzerland's Roger Federer as he serves during his Men's Singles tennis match against Argentina's Juan Martin Del Potro at Wimbledon, Wednesday June 27, 2007. The shoes bear a personalized crest on the rear of them, and four Swiss flags representing Federer's four consecutive Wimbledon Men's Singles title wins on the sides. (AP Photo/Alastair Grant) ** EDITORIAL USE ONLY **