Grunting has become synonymous with tennis success in recent years, with players like Maria Sharapova and Serena Williams taking things to a whole new decibel level.
The success of those women is due in large part to talent, but according to a study conducted jointly by the University of Hawaii and the University of British Columbia, their grunts also give them a big advantage over the competition.
The study found that players who grunted created a significant distraction for opponents, giving the loud players an edge.
Finally there is some evidence to support the obvious!
Here's a look at 10 of the worst grunting offenders in sports: