While playing tennis, after you pick your character click on the one in the first row. It turns into a ? When you start the game a computer player will show up. You can also click on the computers charaters and turn them into yours. If you do the game screen will go split screen but if your faceing your own characters you control them so you could make your side win easier.
The faster you swing the controller, the faster you move your ball. Remember to let go of B to let the ball go.
If you jab the numchuck to left while curving it, it will hit them on their side.
When playing Wii baseball and you are batting hold down B and A at the same time to make your hit more powerful. If your pitching, press the two buttons to pitch under hand. Press the one button to pitch overhand again.