Former Cubs pitcher Jon Lester, part of team's World Series core, announces his retirement - Chicago Sun-Times
Jon Lester retires after epic MLB career as Red Sox, Cubs ace - Sports Illustrated
Jon Lester retires after epic MLB career as Red Sox, Cubs ace - Sports Illustrated
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
Jon Lester: Former Chicago Cubs, Boston Red Sox ace retires
Boston Red Sox - Wikipedia
Jon Lester traded to Oakland Athletics, Yoenis Cespedes to Boston Red Sox - ESPN
David Ross helps Red Sox, Cubs to titles
Trea_Turner
Former Cubs, Red Sox pitcher Jon Lester announces retirement National News - Bally Sports
Boston Red Sox pitchers Josh Beckett, Jon Lester look to mend fences
Two cities, one legend: Jon Lester reflects on one of a kind career with Sox, Cubs, Sports
Jon Lester retires: Five-time All-Star and three-time World Series champion calls it a career after 16 seasons