We turned extra combative last night on "The Knee Jerks", my weekly sports gabfest with Big Al from The Wayne Fontes Experience.That's because our guest was none other than Marvin Hagler, Jr., son of the multiple world champion boxer.Junior was on to discuss his upcoming professional boxing debut, set to take place on Saturday near Philadelphia. It's the headliner of a Celebrity Boxing card, but Marvin is no typical celebrity boxer. He's got that famous pedigree, and, at...