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

Former Cardinal Jon Lester Retires

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

Jon Lester - Wikipedia

Three-time World Series champion Jon Lester announces retirement

Former Cubs pitcher Jon Lester, part of team's World Series core, announces his retirement - Chicago Sun-Times

Former All-Star pitcher Jon Lester announces retirement after 16 MLB seasons

Jon Lester, former Red Sox ace and World Series champ, retires from MLB – NBC Sports Boston

Red Sox should be reminded they lowballed Jon Lester with news of his retirement

Jon Lester retires