The NBA doesn't have as many impact rookies as other major leagues such as the NFL, MLB or NHL. This doesn't mean that you can't draft a player who will immediately make a difference for your team though.
What it does mean is that teams will have to evaluate every aspect of a player's game to pre-determine exactly how that rookie will contribute.
Rebounding and defense translate the quickest to the NBA but this list will not be limited to just big men. Here is a look at the players who will make a huge impact from day one on their respective team.