Here's some nifty little things I found so you can show off to your friends or whoop there Sony lovin' asses in a round of Tennis, or whatever game you fancy. Here is the site.
Wii Sports cheats, codes, hints, FAQs: Nintendo Wii
I use the gold bowling ball, it's my lucky one. I got a score of 220 with it. And the power serves in Tennis kill the computer.
I hope this makes the game more enjoyable.
And thanks to gamewinners.com