hmm...what do you mean by side spin? as in when it bounces it goes off to the side because of a spin? or if you hit it early it goes to the side of the court? I'm assuming you mean the first one, in which case i have no idea how you did, but I'd like to know how you did it ^_^"
also, about that second case, does anyone know how to hit those balls that hit like right on the line on the mid-left/-right of the court? My mii is usually near the middle or a little closer to where the ball will land, but i can NEVER hit those!!! thats how my girlfriend beats me at Wii Tennis -__-'