Minnesota Vikings - Tark
Cincinnati Reds - Pete Rose, with Johnny Bench pulling a close second
BoSox - Teddy Ballgame
For college its a bitter harder to determine, given the relative short-term tenure compared to pro sports, and far more players to worry about in a college's history, so I'll go with players I've seen in my lifetime
Kansas State football - Michael Bishop
Kansas State basketball - Mitch Richmond
Michigan football - Charles Woodson
Michigan basketball - Chris Webber