Not by Blacks. By Kenyans. They have the only genetic difference that gives them an advantage over everyone else, including other Blacks, in running.
They have longer femurs. At the top level, only mental thinking is what makes color important. Scientists have come to the conclusion that if you think one color is better at one thing, then obviously, that will be the result.
But if the athletes just think the other person is just a normal human, they all perform at exactly the same athletic level.
tl,dr; Only fags think that race means anything, unless you're Kenyan.