Your example of sports is very interesting. I agree that above a certain level, any team etc. is inherently notable. There is still, however, the question of available sources,
I'm not a sports connoisseur, but if I go to a typical library, there is a range of books on popular *male* sports. I can find biographies of famous players, histories of major clubs, etc. A quick Amazon search for instance shows me that they have a book on sale about the successes of AS Saint-Etienne in the French football (that's soccer for Americans) championship in 1976!
I do not find such books on female sports. In fact, if I look for a book on the French women's soccer team on Amazon, I find something... extracted from Wikipedia! (Recall that football is the most popular sport in France...)
In short, for certain topics (e.g. male sports), there is a gazillion books, biographies, and other source material readily available, while for others (e.g. female sports) such sources are more difficult to find.
What I would like to understand is how much the bias is caused by such imbalances in sources. A possible evaluation method would be to consider female and male personalities (e.g. writers) equal in notoriety (e.g. according to scholars from that field), and to compare the length and quality of the biographies. What do you think?