I think Badonkadon wants a triangular tennis court or something... to spice it up.
Actually that would be quite cool... a 1vs1vs1 match with a court shaped like a Mercedes badge (circular and split into three)
--"And there seems to be a second one, which I never knew about."
Yes if you press a button while the screen is black (after selecting Miis... before selecting who plays where) you can play a normal game of tennis but on the court that the practice games are on, which is blue and has no stands.
similar things are possible in the other games... (all while the screen is black after selecting Miis)
In Bowling pressing different directions on the + pad gives you a different coloured ball.
In Golf one of the buttons turns off all the guides (wind/power meter etc)
In Boxing if you have beaten Matt you can press a button to use silver boxing gloves.
I can't remember what happens in baseball.
