Jon Lester announces retirement from MLB after 16 seasons
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Jon Lester was an amazing person to have on the Chicago Cubs
Former Red Sox ace Jon Lester, three-time World Series champ, retires after 16 seasons - The Boston Globe
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Boone takes leave for pacemaker; Lester to have surgery
In an Era of Throwers, Adam Wainwright Is a Pitcher - The New York Times
A look back at Jon Lester's career - Beyond the Box Score
Jon Lester retires after epic MLB career as Red Sox, Cubs ace - Sports Illustrated
MLB veteran pitcher Jon Lester retires after 16 seasons
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