Mario Power Tennis/Tournaments and Special Games

You should know the drill if you played Mario Tennis before. A tournament is like a tree and starting from the roots, going up to the top. It's important to go through this to unlock characters, courts and other special needs that you want in this game. So eight players or sixteen for doubles would cut down to one or two winners of the tournament.

Mushroom Cup
This is the easiest in all cups. First and second round is a one set match. The final one is a three set match.

Note: Save every round because you won't have a second chance of doing it again. Especially if you're in a middle of it and has to finish other errands before getting back into the game.