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 Men's 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.
He has an undergraduate degree from Yale University and a law degree from the University of Pennsylvania.