Sorry manu but i have to agree with TOG.
A Winner is the same than an ace, is only a winner or an ace when your opponent don't touch on the ball.
I play tennis in real life and i know really well that.
When you do a little but liiiiiiiiitle touch on the ball that is count as a forced error, because you could not return it.
So, i think it has to change...
A winner is the same than an ace, is only a winner or an ace when the opponent doesn't touch on the ball, if he touch a little it is counted as a forced error.