Or could it possibly be due to basketball being the number one game black kids play, causing a large number of them to excel throughout the grades and well into college?
That would almost seem reasonable. However, on many college teams there are slightly more blacks than white players, but not nearly the high ratio that is seen in the pros.
It's the one major sport that can be played in a small area...if mom's living in high rise government housing, how much room do you have to play sports? And if you're living way out in the country with no others to play with, you can always shoot hoops.
That does better explain it somewhat, but then look at most marathon winners. What do most of them have in common?