Enter the following at the cheat screen:

Effect - Code 
Black Ball - R2, R2, Circle, L2
Block Party - R1, Circle, L2, R2
Enable Jump Shot Release Text - L1, L1, R1, R1, Circle, Circle, Square, Square
Faster Clock - Circle(x3), Square(x3), L1, L2
Normal Ball - R1, Square, Square, L1
Perfect Field Goals - Circle, Circle, Circle, Square, Square, Square, R1, R2
Power Game - R2, Circle, L2, Circle
Red, White, and Blue Ball - Circle, R2, Square, R2
Super Steal Ability - Square, R2, Square, R1, Circle, L1, Circle, L2
Turn Momentum Meter Off - Square, Circle, Circle, Square, L1, L2, R2, Square
Unlock All Courts - Square, Square, L1, R2, L1, Circle, L2, Circle
Unlock All Teams - Square, Square, L1, R2, L1, Circle, L2, Circle 

Uniform Codes: 
Brick City Uniforms - R1, L2, R1, L1, Circle, Square, R1, L1
Clown Uniforms - Square, L1, Square, Circle
Cowboy Uniforms - Circle, R2, R2, R1
Kung Fu Uniforms - Circle, Circle, Square, L1
Pimp Uniforms - R1, Square, Circle, L2
Santa Uniforms - R2, L2, R2, L2
Tuxedo Uniforms - L2, L2, Circle, Square 

Player Unlock Hints: 

Xzhibit: 
Get Lord of the Court status at venice beach court under any difficulty 

AO: 
Play in World Tournament and defeat the Dominators on any difficulty level. It will require 10,000 dollars to unlock him. 

Headache: 
Play in World Tournament and defeat the Eastside Assasins on any difficulty level. It will require 10,000 dollars to unlock him. 

The Future: 
Play in World Tournament and defeat the Highflying Homies on any difficulty level. It will require 10,000 dollars to unlock him. 

Booger: 
Play in World Tournament and defeat the Mad Bombers on any difficulty level. It will require 10,000 dollars to unlock him. 

Main Event: 
Play in World Tournament and defeat the Oaktown Ballers on any difficulty level. It will require 10,000 dollars to unlock him. 

Hot Sauce: 
Play in World Tournament and defeat the Showtime Hoopstars on any difficulty level. It will require 10,000 dollars to unlock him. 

Dennis Rodman: 
Play on Balla, and get 10 rebounds or more. An easy way to do this is to play on 20 mins, this way, you're sure to get a lot of rebounds. 

1/2 Man 1/2 Amazing: 
Play World Tournament. When you get to the Urban Hitmen beat them. Cannot use him until you pay $10,000 

Speedy: 
Start a world tournament. Speedy will automatically be unlocked. 

Ludacris: 
Win every Lord of the Court challenge. 

DMX: 
Win every Lord of the Court challenge. 

Silk The Shocker: 
Win Lord of The Court in Shakespeare Park. 

Cypress Hill: 
Win World Tournament under Greatest of all time difficulty setting. 

DJ Muggz: 
Win World Tournament under Greatest of all time difficulty setting. 

Bobo: 
Win World Tournament under Greatest of all time difficulty setting. 

Team Unlock Hints: 

Kinshasha Warriors: 
Beat the World Tournament 4 times under Greatest of All Time difficulty 

Athens Minotaurs: 
Beat the World Tournament 3 times under Greatest of All Time difficulty 

London Knights: 
Beat The World Tournament 2 times under Greatest of All Time difficulty 

San Juan Coquis Team: 
Beat World Tournament once under Balla difficulty. 

And1 Mixtapes Unlock Hints:
Volume 3 - Win Lord of the Court at The Dome.
Volume 4 - Win Lord of the Court at Rucker Park.
Volume 5 - Win Lord of the Court at The Cage.