For the head of Wimbledon, there's an uncomfortable problem plaguing the sport of women's tennis: the high decibel grunting. "If you say 'what do you get most letters about’, I would say that grunting is high up,” Ian Ritchie tells Britain's Telegraph.  Fans are complaining that moaning players are spoiling the game and other women tennis players complain that loud players are a distraction on the court, says Ritchie.  “We have discussed it with the tours and we believe it is helpful to reduce the amount of grunting,” he said, blaming the issue on an "education problem" involving the younger players. So who are the worst offenders? The Telegraph lists Belarussian Victoria Azarenka whose moans have registered at 95 decibels and Russian Maria Sharapova who clocks in at an astounding 105 decibels. What does that kind of sonic power feel like? We rounded up highlight reels from Azarenka, Sharapova and other honorable mentions in the world of high octane women's tennis grunting: 

Victoria Azarenka In the following clip, Azarenka squares off against Serena William, demonstrating her signature bird-like grunt:

Maria Sharapova  The queen of the grunts with the loudest levels recorded, Sharapova's wail sounds more cathartic than anything. Her record-setting 105 decibel grunt was recorded in 2009.

Serena Williams Squaring off against her sister Venus, Serena exhibits a more forceful grunt than her sibling:

Elena Bovina This clip comes from Russian tennis star Elena Bovina whose grunt has been described as a "sneeze-like groan."

Michelle Larcher de Brito This Portuguese tennis star puts out an impressive grunt for her age. In the below video she's only 15-years-old.