Grass court, originally known as "lawn tennis", became popular during the Victorian era and was the only court that was played on in the majority of tournaments up until the 1970s. Out of the four Grand Slams - Australian Open, French Open, Wimbledon Open and US Open. The Wimbledon Open is the only Grand Slam event played on grass. 

Of the three courts, grass has the lowest coefficient of friction. According to a study conducted by the International Tennis Federation (ITF),  it was found that a tennis ball shot without spin and travelling at 67 mph would maintain a speed of 45 mph after hitting the surface. Additionally, grass courts begin to appear sluggish as the game continues. This is because the more the players run around the hard packed earth, the more they soften it up and decrease the coefficient of restitution while at the same time increasing the coefficient of friction of the court. The grass court with the lowest coefficient of friction also has the lowest angle of rebound, this results in the ball maintaining a low and flat trajectory.