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Jon Lester - Wikipedia
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Bond between Cubs' David Ross, Jon Lester began by chance in Boston
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Jon Lester retires: Former Red Sox, Cubs ace concludes 16-year career - Sports Illustrated
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Trading Yoenis Cespedes for Jon Lester has saved the Athletics' season - Athletics Nation
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Jon Lester, Former Red Sox Ace and World Series Champ, Retires From MLB – NBC Chicago
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October 28, 2007: Red Sox complete sweep of Rockies to win World Series – Society for American Baseball Research
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Morning sports update: Jon Lester reacts to Red Sox admitting they 'blew' 2014 contract negotiations
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Wakefield's injuries give Lester another chance – The Denver Post
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MLB Predictions: 10 Reasons the Red Sox' Jon Lester Will Win 2011 Cy Young Award, News, Scores, Highlights, Stats, and Rumors
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Trea_Turner
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A look back at Jon Lester's career - Beyond the Box Score
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Former Cubs pitcher Jon Lester, part of team's World Series core, announces his retirement - Chicago Sun-Times
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Red Sox' Pitching Change Is Paying Off - The New York Times