Gonzalo Lama beat Robin Haase (6-3, 6-3) at the Prostejov ATP Challenger event over the weekend. As you will hear, during the second set, Lama was really exerting himself, grunting during every shot. Understandably, this eventually started to annoy Haase. So he did what any mature adult male would have done and screamed while hitting a return of his own.
The umpire called Haase for hindrance because you can grunt loudly, but not yell. Tennis is a funny sport like that.