im to lazy to check it out right now cuz i'm on the computer and also i kinda remeber. the reason why i was asking this also cuz some one at IGN said that to unlock jerseys is to complete Superstar challenge mode.
The Freestyle Dunk-Off involves two players going head to head on a split screen. As many dunks as they can complete to reach a target score, with the first player to reach the target score being the winner. Missed dunks and aborted dunks result in lost points.
The Freestyle Shootout is also head to head split screen, and is just one round of the three point shootout featuring two players, highest score wins.