Because of the rule change forcing incoming freshmen to play at least one year in college before declaring for the draft, it's now a rarity to see upperclassmen at the top of a draft board.
In the 2010 draft, the first senior was taken with the 23rd pick (Trevor Booker). The 2009 draft was similar, with the first senior being taken with the 11th pick (Terrence Williams).
It is becoming rarer and rarer for players to bypass millions of dollars and entering the NBA for a chance to win an NCAA championship.
This draft is no different. Top prospects Derrick Williams, Kyrie Irving and Harrison Barnes are either freshmen or sophomores.
The draft order is still to be determined, but going by overall win-loss records, here is a complete NBA mock draft, full of underclassmen.