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Jon Lester announces retirement after 16 seasons, three World Series titles - ESPN
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Jon Lester retires
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Jon Lester remembered for World Series Game 5 with Cubs
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Jon Lester, done after 16 seasons, gave the Red Sox everything he had — something today's starters aren't asked to do - The Boston Globe
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Jon Lester announces retirement after 16 seasons, three World Series titles - ESPN
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Former Oakland A's pitcher Jon Lester retires
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Jon Lester: Breaking News, Rumors & Highlights
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Jon Lester Announces Retirement From MLB After 16 Seasons – OutKick
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Jon Lester talks about life after retirement from baseball
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Jon_Lester
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The Rundown: Tip of the Cap to Lester, Cubs Sign IFA Studs, League Awaits Union Counter, MLB Veterans Talk Diversity on MLK Day - Cubs Insider
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Longtime Red Sox ace Jon Lester retires after 16 MLB seasons