I think that there probably is little to no difference in black and white when comparing Africans to Europeans, however there likely is a small difference between American blacks and whites because of unpleasant realities (slave trade etc) where biggest, strongest, most athletic etc slaves were selected. This has an influence on the domination of American sports by African Americans imo. (Also, I am aware there are descendants of slaves across the world and I Europe from the transatlantic slave trade, but America is the most clear example. I also realize that physiologically different races tend to have different characteristics that make them better at different sports on average.)
Even this is a very taboo discussion and perspective to have last I checked. And of course it is not the only reason for the "dominance" in American sports by people of slave descent. Poverty and lack of other opportunities is a major reason as well. BUT as terrible as it sounds slavers and slave owners very intently picked out slaves based on physical attributes.