According to various tennis experts, 'grunting' on the court can help release tension, synchronise breathing, increase focus and increase core stability.

Its effectiveness and whether it is indeed 'fair' have long been questioned as many players continue to adopt the tactic.

Rule 26 of the International Tennis Federation states: "If a player is hindered in playing the point by a deliberate act of the opponent, the player shall win the point.

"However, the point shall be replayed if a player is hindered in playing the point by either an unintentional act of the opponent, or something outside the player's own control."

So what is it then? Is it fair? Is it a deliberate attempt to put the opponent off? One thing is for certain, it has quickly become one of the most controversial aspects of modern tennis.

The crowd clearly don't like it, but it has unfortunately become an accepted part of the game.

Women's world number one Maria Sharapova has been dubbed the 'queen of screams'. It is also widely believed that Monica Seles introduced the 'ultimate grunt' at Wimbledon in 1992.

In the men's game - Novak Djokovic, Rafael Nadal and Andy Murray have also all been guilty of 'grunting' while on court in recent years.

With that in mind, Sports Mole has brought you a selection of the best grunters ahead of the start of Wimbledon next week:

Maria Sharapova (Women's world number one) – The Hyena:

Victoria Azarenka (Women's world number two) - The Wolf:

Novak Djokovic (Men's world number one) - The Barn Owl:

Rafael Nadal (Men's world number two) - The Warthog:

Andy Murray (Men's world number four) – The Highland Cow:

Lastly, we bring you a video of how tennis could quickly emerge as a very successful musical genre: