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Lewis Jon Wertheim (born November 11, 1970 in Bloomington, Indiana) is a sports journalist and author. He has been a full-time staff member for Sports Illustrated since 1997 and has covered tennis, the NBA, sports business and mixed martial arts. He is the author of the book, Strokes of Genius: Federer, Nadal, and the Greatest Match Ever Played, which gives a stroke by stroke analysis of the 2008 Mens Singles Wimbledon final between Roger Federer and Rafael Nadal, and is a co-author (along with Toby Moskowitz) of the book Scorecasting: The Hidden Influences Behind How Sports Are Played and Games Are Won, a wide-ranging statistical analysis of common misconceptions in American sports.
He lives in New York with his wife Ellie and their two children.