Lizzy
How to unlock: You must defeat Harley's tour mode.

Everything
How to unlock: You enter "Cut To The Chase" as your name. Hold down L1 and R1 and then save.

Slaughterhouse
Finish all drills for any character.

Unlockable Characters
Afrodite - Clear Vinny's Tour Mode.
Golf-ball - Clear Ice Trey's Tour Mode.
Ice Trey Clear Shawnee's Tour Mode.
Kiku - Clear Donna's Tour Mode.
Luther - Clear Ice-Trey's Tour Mode.
Natasha - Clear Summer's Tour Mode.
Shawnee - Clear Sven's Tour Mode.
Sven - Clear Killer's Tour Mode.
Tennis ball Bruce - Clear Bruce's Tour Mode.
Tennis ball Luther - Clear Luther's Tour mode.
Tennis ball Killer - Clear Killer's Tour mode.
Tennis ball Sven - Clear Sven's Tour mode.
Tommy - Clear Kiku's Tour mode.
Vinny - Clear El-Suave's Tour mode.
Volleyball Shawnee - Clear Shawnee's Tour mode.

PS2 Cheats for Outlaw Tennis

Outlaw Tennis cheat codes

Outlaw Tennis cheats