That grunting (and shrieking) is really getting on my nerves.
What is that horrible sound?
That is the sound of cheating, according to Caroline Wozniacki:
I think there are some players who do it on purpose. They don’t do it in practice and then they come into the match and they grunt. I think they [officials] could definitely cut it. If you grunt really loudly your opponent cannot hear how you hit the ball. Because the grunt is so loud, you think the ball is coming fast and suddenly the ball just goes slowly. In tight moments, maybe the grunt helps them with getting less nervous.
So whom is the Woz’s remark aimed at?