Jon Lester retires after epic MLB career as Red Sox, Cubs ace - Sports Illustrated
Jon Lester, former Cubs ace and World Series champ, retires from MLB – NBC Sports Chicago
Jon Lester: Former Chicago Cubs, Boston Red Sox ace retires
John Lackey - Wikipedia
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Jon Lester retires: Five-time All-Star and three-time World Series champion calls it a career after 16 seasons
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Jon Lester, Cubs agree to a six-year, $155 million deal
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RUN ITS COURSE': Ex-Red Sox, Cubs ace Jon Lester to retire