Mario loves a lot of things, including Tennis. A few years ago, a game called Mario Power Tennis appeared on the GameCube and became a favorite among Mario enthusiasts.
Now that the Wii is here and Mario Power Tennis is a Tennis game, Nintendo decided it'd be a great title to port over with the new controls.
Wanna know how that worked out? I'll give you a hint: about as well as a lead balloon. Don't believe me? Check out this X-Play review of New Play Control Mario Power Tennis.