Jon Lester retires after epic MLB career as Red Sox, Cubs ace - Sports Illustrated
Jon Lester announces retirement after 16 seasons, three World Series titles - ESPN
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Jon Lester has announced his retirement - Bleed Cubbie Blue
Jon Lester, Former Red Sox Ace and World Series Champ, Retires From MLB – NBC Chicago
Jon Lester retires after epic MLB career as Red Sox, Cubs ace - Sports Illustrated
Jon Lester hits free agency after Cubs decline option; is a Boston Red Sox reunion possible?
Jon Lester Retires After 16 MLB Seasons; Won 3 World Series with Red Sox and Cubs, News, Scores, Highlights, Stats, and Rumors
Cubs-pedia -- Everything you need to know about the Lovable Losers - ESPN
Jon Lester announces retirement after 16 seasons, three World Series titles - ESPN