The root of Jon Lester's struggles may go back to last season. During an extended bullpen session yesterday, in which three batters stood in against him but didn't take swings, Lester aimed to correct a flaw in his delivery that he believes existed at times last year. According to pitching coach Bob McClure, Lester has been swinging his leg in a way that alters the angle at which he releases the ball.
Swing shift for Jon Lester
Boston Herald | Jul 26