Has Erik Miller already become the key lefty in the Giants bullpen?
Erik Miller has only thrown 264 pitches in his major league career, but that’s a good enough sample to pass the eye test. The San Francisco Giants might have a guy. A 6-5 southpaw with just 159.1 pro innings entering his age-26 season averaging 96 mph with a four-seamer and a mind-blowing 2,694 rpm slider?…