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History of the Boston Red Sox - Wikipedia
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Jon Lester, former Cubs, Red Sox pitcher, announces retirement
Jon Lester, former Boston Red Sox pitcher, retires after 16-year MLB career (report)
A look back at Jon Lester's career - Beyond the Box Score
Former Cubs, Red Sox pitcher Jon Lester announces retirement National News - Bally Sports
Jon Lester Retires After 16 MLB Seasons; Won 3 World Series with Red Sox and Cubs, News, Scores, Highlights, Stats, and Rumors
Jon Lester beat the yips with focus and determination - Sports Illustrated