Kolkmann says that asphalt courts can also develop low areas over time due to settling of the soil or base under the asphalt surface. "With a post-tensioned slab, this area can be bridged and no settling will occur. In addition, concrete courts can often be installed on unstable soils where it would be cost-prohibitive to do extensive excavating and base work to support an asphalt court," he says.
Tennis is a racket sport that can be played individually against a single opponent (singles) or between two teams of two players each (doubles). Each player uses a tennis racket that is strung with cord to strike a hollow rubber ball covered with felt over or around a net and into the opponent's court. The object of the game is to maneuver the ball in such a way that the opponent is not able to play a valid return. The player who is unable to return the ball will not gain a point, while the opposite player will.