CheatCodes.com has all the official Tennis Arena PSX cheats to unlock everything. If you know of any that we don't have, please let us know.
All published and official codes as of Saturday May 18, 2013 for Tennis Arena are shown below.
At the Smart Dog logo screen, press Up, Down, Left, Right, Start. If you entered the code correctly, you will hear a voice say "Yeah." Then, additional characters and the Canyon court will be available in "Smash Tennis" mode.
While playing a game, hold R1 + R2 and press X, Square, Circle, Square, X, Triangle. Then release R1 + R2, and press Select.
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