I guess, it will be 10-15 years until I will be slow enough to ever hit a winner on me using an underhand serve, just not going to happen. Even then, like I mentioned, I for one won't be standing that far away from the service box like the pros do, couldn't even do that if I wanted, the courts aren't big enough. I think the category of "winners" is a lot larger than underhand serves, probably 100 times more broad.Because that seems like nonsense. It sounds like "Don't hit winners! You might annoy the other guy into playing better!"