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Athletics 2014 season review: Jon Lester, the ringer who wasn't enough - Athletics Nation
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Jon Lester - Wikipedia
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Chicago Cubs starter Jon Lester and his playoff history
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Jon Lester, Major League Baseball, News, Scores, Highlights, Stats, and Rumors
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Top 5 moments from Lester's career
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Jon Lester draws comparison between Cubs and Sox signings - Marquee Sports Network
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Red Sox, Cubs pitcher Jon Lester retires after 16 years, 3 World Series titles
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Jon Lester makes his return to Wrigley Field as a fan
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2018 NL Central Preview: Chicago Cubs - Brew Crew Ball
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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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Boston Red Sox: Jon Lester is a buy-low free-agent option
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Is Jon Lester a Hall of Famer? How postseason greatness gives him a chance at Cooperstown
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Jon Lester Is Top Free-Agent Signing In Cubs History -- Will Theo Epstein Ink Another Winner In '19?