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What is the one-and-done rule in the NBA?

Beginning with the 2006 draft, the NBA instituted a new requirement: players would be eligible to be selected to the world’s premier basketball league only if they met two criteria: (1) at least one year had elapsed since the player graduated from high school and (2) the player turned 19 in the year of the draft. As a result, many of the best players began spending just one year in college before turning pro. This practice earned the name “one and done.”