"As we have said before ....... that noise is needless and wrong."
I don't know about "wrong" but I disagree with needless. Most martial arts include a grunt or "kia" when striking or falling that tends to strengthen the core (torso) and focus energy into the strike. I don't see why the same wouldn't apply in tennis or any other sport.
Maria sounds like she's having excellent sex when she hits the ball............. hmmm.
;-)
I have no problem with a grund and the torso issue is a great one, but she elongates her noise and projects like a Yetti horror flick.