Jon Lester announces retirement from MLB after 16 seasons
Jon Lester announces retirement after 16 seasons, three World Series titles - ESPN
Jon Lester, former Red Sox ace and World Series champ, retires from MLB – NBC Sports Boston
Jon Lester retires
Former Cubs pitcher Jon Lester, part of team's World Series core, announces his retirement - Chicago Sun-Times
Jon Lester Retires After 16 MLB Seasons; Won 3 World Series with Red Sox and Cubs, News, Scores, Highlights, Stats, and Rumors
Jon Lester - Wikipedia
Jon Lester, former Boston Red Sox pitcher, retires after 16-year MLB career (report)
RUN ITS COURSE': Ex-Red Sox, Cubs ace Jon Lester to retire
Former Cubs, Red Sox pitcher Jon Lester announces retirement