Former Cubs pitcher Jon Lester, part of team's World Series core
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Former Oakland A's pitcher Jon Lester retires
Jon Lester - Wikipedia
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Jon Lester, Cubs agree to a six-year, $155 million deal
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Jon Lester, former Cubs, Red Sox pitcher, announces retirement
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A look back at Jon Lester's career - Beyond the Box Score
Jon Lester retires: Former Red Sox, Cubs ace concludes 16-year
Jon Lester - Wikipedia