Super Spike V'Ball (NES / Famicom)

This game became quite the thing with my group of friends as a kid, though the huge push it was getting from Nintendo Power at the time may have helped with that. :p  It was quite a good game, though.  Very nice visuals for the time, responsive, simple controls, and it was actually pretty long.  Certainly one of the more popular NES sports games of its time that it would seem a lot of people today have forgotten about.