Sega Sports Tennis Cheat Codes for Playstation 2

Special rackets
In the world tour mode, beat opponents in level 3 and higher without losing a set. If you win a straight set you will get a special racket in every championship that you win.

King's Court
Beat King and Queen in the mixed double match on level 5 in world tour mode to unlock King's Court. This level 5 will only be available if you won the mixed double match in level 4. Both matches will take place in December.

Play as King or Queen
Win all matches without using any continues. If using a male character, you will face King. If female, you will face Queen. Beat them to unlock them as playable characters.

Alternate costumes
At the character select screen, hold L1 or R1 and choose a character with the button still held.