Jon Lester left Sunday's 15-7 loss to the Toronto Blue Jay in the fifth-inning to boos from the crowd at Fenway. Is his problem physical, mental or something that hasn't even been brought up?

FORT MYERS, Fla. — Nearly 10 years had passed since Jon Lester last put on a Red Sox uniform. That changed Thursday, when the three-time World Series-winning pitcher pulled on a navy blue hoodie ...