So yeah, instead of forfeiting, how about discussion on how to beat these guys?
Here's what I do to have some success using my shot counter/return counter character.
Against Topspin Invasion/Monster Defense Type:
Deep control shots to the corner if I can do it. Mix in a lot of slices if the other guy doesn't seem to know the timing. Usually I wear them out and get a short cross topspin shot or a fully charged flat shot to the open court.
Power/Serve Type:
Aside from just weathering the storm to the tie break, I tend to just straddle the outside corner line and try to psyche the opponent out to hit it towards me. Then it's just a coinflip. I use a top spin return to the open court, hope it lands, then hope I don't stutterstep