Parity.

About Parity

In sports, parity refers to when participating teams have roughly equivalent levels of talent. In such a league, the "best" team is not significantly better than the "worst" team. This leads to more competitive contests in which the winner cannot be easily predicted. The opposite condition, which could be considered "disparity" between teams, is a condition in which the elite teams are so much more talented that the lesser teams are hopelessly outmatched.