Traditional grass courts are out of the ordinary, so to speak.
The surface is known to play slightly slower than clay and hardcourt, the other two used on the professional tour.
Mostly known in Great Britain, grass courts date back to the 1870s when the Championships at Wimbledon first took place.
Initially men's singles was the only event held, but a decade later ladies singles was added to the tournament and have been competing each year since.
With Wimbledon approaching in less than a week's time, fans will be looking to choose their favorite to take home the crown on July 3rd.
The tournament seeds have yet to be drawn, so here are the current top 10 women's grass tennis players.