Originally Posted by JW10S
would have to start before contact, not during or after, to have any effect on the ball.
what we know is that we have the strong evidence that it has started enough
before, whatever that may be, to give the telling side aspect to the top spin.
Often is enough on their hard hit balls to force them to curve their path,
So we can be pretty sure it is happening in time for anyone who even thinks
there is a question on this.