New details are in regarding Mario Tennis Open. Nintendo have confirmed that you'll be able to import your own Miis in to the game, as well as giving players the chance to customise existing characters - giving examples of a Bullet Bill costume, or Princess Peach's shoes - with a number of stat-boosting accessories available.
The game will be controllable via touchscreen or with regular button inputs, with the 3DS' gyroscope also integrated somehow. When it comes to multiplayer, there'll be four-player matches available, both local and online, as well as leaderboard places to chase.
Mario Tennis Open launches on 3DS in Europe on May 25th.