Mia Hamm?
I'd hit it... well at least back in her UNC days.... oh who am I kidding, i'd hit it in ten years.
Anyway... The Babe Ruth/Michael Jordan Comparisons would be accurate if Women's Pro Soccer (or international) had reached the popularity of Baseball or Basketbal at the Height of those two guys careers... (This incidentally, has everything to do with that considered "greatness" that we place on these two gentlemen... Barry Bonds might be a better hitter than Ruth was, or LeBron James may be better hoops player than Jordan, but it was their ability to elevate their sport that gives them that rarified level of greatness... to do what no one before had done and capture the imagination of the public.)
Theortically, what we see with Mia Hamm is more likely a Honus Wagner (OR whoever- but lets imagine that Wagner or whoever inspired Ruth to become what he was later.) to someone else's Ruth.... because like Ruth and Jordan, the talent will need to meet the opportunity.... which is an interest base in Women's sport, or soccer in particular... Hamm can maybe be Dr. J to someone else's Jordan...