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The Clay Court is a tennis court that appears in all Mario Tennis games. In Mario Tennis (Game Boy Color) and Mario Tennis: Power Tour it is where the senior-ranked players play. Alex, Nina, Clay and Ace also play here to try to advance their way to varsity-ranked. Its ground is an orange-like color in all games. It has a slow speed and weak bounce, making a harder court to play on. Defensive or fast characters will be put to a slight advantage due to their statistics.
Mario Tennis (Nintendo 64)
The Clay Court makes its first appearance in the Nintendo 64 title, Mario Tennis. The court is a brown color and has a slow ball speed and weak bounce, setting the standard for all subsequent Mario Tennis games.
Mario Tennis (Game Boy Color)
The Clay Court appears for a second time in the Game Boy Color version of Mario Tennis. It acts and looks the same as the 64 version and is used by the player (Alex or Nina) in story mode to beat the senior ranked players to move on to the varsity ranked.
Mario Power Tennis
Mario Tennis: Power Tour
The Clay Courtonce again appears in Mario Tennis: Power Tour for the Game Boy Advance, acting the same as all previous games and being used in the same way as it was used in Mario Tennis for the Game Boy Color, acting as the court used for the senior-ranked players.
Mario Tennis Open
Mario Tennis: Ultra Smash
The Clay Court appears in Mario Tennis: Ultra Smash as one of the nine courts avaliable. The ball speed and bounce are both given two stars, which matches the equivalent terms "slow" and "weak", as the Sand Court has the equivalent of "slowest" and "weakest". It is described as a court "Covered with clay, giving a ball speed slower than the hard court."