Thanks for the download archive of CC part 1!
Yes, it is more difficult but you should really try to play a Center Court 2 double match. Reduce the opponent CPU`s to around halv and you should be able to win. By the way, double is more dynamic/action and makes more fun to play. I already managed to do some aces in a row. Its just a timing thing how long you hold the joystick in the right direction.
Background sound ("S_background" 8svx file):
Because it nerves a bit after some time like someone already mentioned I changed it. There seems to be a size limit (a >200kb file didn`t worked) but otherwise each 8svx sample should go. Without size limit you could use your favorite music and play party tennis.
I like the original sample with halve volume and lowpass filter.