marcus vick, brian scalabrine, billy ripken and freddy adu.
kidding.
id go Michael Jordan, ali, tom brady, and LeBron james.
the first 2 should be unanimous. wouldn't even listen to anyone that said otherwise. the other 2, I think combine everything needed to be included better than anyone else. they have changed ( or helped change) the games they play, they have had historic games, seasons and careers, they have won at the highest level multiple times, they have the individual awards, they are names everyone knows, and most importantly, for all they have already done, they aren't finished yet.
also, no golfer, bowler, tennis player, race car driver, swimmer, poker player, skater or any other bs belongs on any sports royalty list.