In the year 2005 the National Basketball Association (NBA) implemented a new policy to its collective bargaining agreement (CBA). This new policy, Article X, said that a player entering the NBA draft must be at least 19 years old and a calendar year has passed since his graduation from high school for him to be eligible to enter the NBA Draft. This new policy forced many talented high school athletes to attend one year of college before entering the professional game, hence the “one and done rule.” This influx of talented freshman into college basketball may have shifted the competitive balance of NCAA Division I men’s basketball. A cross sectional time series analysis is used to investigate this claim, that the introduction of Article X affected the competitive balance of college basketball. The deviation of the Herfindahl-Hirschman Index of average conference winning percentage is used as the dependent measure of competitive balance in the regression equation. The main purpose of this study is to discover whether competitive balance in collegiate sports is affected by policies of their professional counterparts.