The "grunt-o-meter" is a hand-held device that's supposed to keep female tennis players in check when it comes to excessive grunting and shrieking on the court.
USA Today reported last year, though, that the current generation of women's tennis players will not be affected by the "grunt-o-meter."
Therefore, players the likes of Serena Williams, Victoria Azarenka, and Maria Sharapova are free to grunt and shriek as loud as they want.
While Maria Sharapova is far and away the loudest tennis player on the women's circuit, she isn't alone in grunting her way through matches.
On a scale from 1 to 10, we've ranked where we think some of the best players in women's tennis fall on the "grunt-o-meter."
10. Petra Kvitova (Grunt-O-Meter Score 1): Kvitova lets her play do all the talking
9. Sara Errani (Grunt-O-Meter Score 2): She's loud, but her "Street Fighter" grunts make her matches more entertaining
8. Samantha Stosur (Grunt-O-Meter Score 3): Her quiet, short grunts are barely noticeable
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