Jon Lester announces retirement after 16 seasons, three World Series titles - ESPN

Washington National for a minute Jon Lester announces retirement after 16-year career - Federal Baseball

Jon Lester retires

Former Cubs pitcher Jon Lester retires after 16 seasons

September 20, 2021: Jon Lester earns 200th and final career win – Society for American Baseball Research

How all 29 other teams can beat the Chicago Cubs - ESPN - SweetSpot- ESPN

Former Cubs, Red Sox pitcher Jon Lester announces retirement

Jon Lester retires

Maybe the best playoff pitcher ever' - What made Jon Lester an October legend and potential Hall of Famer - ESPN

Jon Lester: Former Chicago Cubs, Boston Red Sox ace retires