Easy Outfits
To do this play a Single Player exhibition match, play Singles, select your best character, select COM2 character and make COM2 difficulty 'Novice'. When you win the message 'A new item is avalible at the item shop' will appear on screen with the item you unlocked below. If you select a star character it will be a lot easier winning the match and you can also unlock outfits in the tournament match.
We have more cheats and tips for this game here, Mario Tennis Open cheats
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