Alternate costumes:
Hold L or R and select a character at the selection screen.

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

Special rackets:
In the world tour mode, defeat 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 won.

King's Court:
King's Court will be unlocked if you defeat King and Queen (mixed double) level 5 in world tour mode. This level 5 will only be available if you won the mixed double match in level 4. These both matches will be in December.