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| 1 of 20 Roger Federer's loss Thursday to Ivo Karlovic (coupled with Rafael Nadal's victory Friday over Nicolas Lapentti) ensured the Swiss grandmaster will cede his No. 1 ranking to his Spanish rival on Aug. 18 -- after a mind-blowing 237 consecutive weeks atop the ATP rankings. Here's a look back at some of the highlights from Federer's four-and-a-half-year reign. Photo: Getty Images Latest News
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