Enter the options menu and select "Gameplay". Hold D-pad Left + Left Analog-stick Right and press Start. The "Codes" selection will now be unlocked at the options menu.
Enter DUOTONE at the codes menu, and it will unlock duotone color, which is everything black and white, except your player is in color. I'm not sure this works on PS2, as I play the game on Gamecube.
After unlocking the Cheat Menu, enter MEGASTARS as a case-sensitive code to unlock the Sega Sports, Visual Concepts, and Team 2K2 in exhibition and street modes.
After unlocking the Cheat Menu, enter SPRINGER as a case-sensitive code. Trash will now be blowing with the wind in Street Mode. This cheat will only work on outdoor courts.