Former Cubs, Red Sox pitcher Jon Lester announces retirement
Jon Lester has announced his retirement - Bleed Cubbie Blue
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RUN ITS COURSE': Ex-Red Sox, Cubs ace Jon Lester to retire
David Ross, Oldest Player in World Series, Ends Career in Climactic Game 7 - The New York Times
A look back at Jon Lester's career - Beyond the Box Score
Jon Lester retires: Five-time All-Star and three-time World Series champion calls it a career after 16 seasons
Former Cubs, Red Sox pitcher Jon Lester announces retirement National News - Bally Sports
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Jon Lester retires: Former Red Sox, Cubs ace concludes 16-year career - Sports Illustrated