I live in the midwest, so hockey is pretty huge.
My friend's brother played in the NHL for several seasons, big name goaltender. Meanwhile, my friend played to a high level, never NHL but apparently there was a serious sibling rivalry and almost-NHL is pretty high up there in a sport with thousands and thousands of kids going for it every year.
You might wonder, per David Epstein's "The Sports Gene," how much of this is practice and hard work, how much was the family environment, and how much was genetics. I did.
Why am I talking about this star goalie? I've played squash pretty seriously in tournaments for over a decade and eventually invited my friend (who is not in any kind of shape currently) to come hit. Literally he had never been on a court or played a single racket sport in his life. 30 minutes in he's taking it to me (and I don't suck), and within a year he's top of the club. Then he decides he doesn't have time for it. It would be like a local middle-aged guy running 16:00 in his first race, 15:00 that summer, then hanging them up.
Damn these talented MFs :)