From the Super Mario Wiki
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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 Power Tennis
Mario Tennis Open