I'm going to dip further back pre-BF.net and say Glenn Braggs. He made the big leagues, but did nothing there. Was supposed to come up to help Yount/Molly/Ganter, but just fizzled out. The guy was ripped, but couldn't hit a lick (looks like Tarzan, plays like Jane?). And he was my first autograph. More recent memories include Guererro, Little Ben, and Neugs. But its the first that hurts the worst...