| Unlockable | How to unlock
|
|---|
| All of Star Characters | 15 consecutive knockout challenge wins.
|
| Bowser Jr | Play 10 standard matches in classic tennis mode.
|
| Carpet Court | Play 5 matches on any type.
|
| COM Strength-Ace | 50 consecutive knockout challenge wins.
|
| COM Strength-Pro | 30 consecutive knockout challenge wins.
|
| Dry Bowser | Play 10 simple matches in classic tennis mode.
|
| Ice Court | Play 30 matches on any type.
|
| Morph Court | Win at least one match on all other Courts.
|
| Mushroom Court | Play 10 matches on any type.
|
| Rebound Court | Play 40 matches on any type.
|
| Sand Court | Play 20 matches on any type.
|
| Sprixie | Hit 100 consecutive shots in Mega ball rally.
|
| Toadette | Play 10 Mega battles.
|