Loud grunting is not pervasive in tennis, especially not in amateur tennis. You may hear it more in professional tennis, because it's a specific offensive technique that seemed to have originated from famous trainer Nick Bolletteri, a number of whose students such as Monica Seles and Maria Sharapova were among the loudest grunters on the pro tours. Many consider the exaggerated grunting to be a form of cheating and wish that the existing tennis "hindrance" rule were called against it much more often in professional matches.
