From the Super Mario Wiki
Overview of the Peach Dome
The Peach Dome is the final court at which players have their matches in Mario Power Tennis. On one side of the dome, an elevated stage stands before the court. This is the seating for Princess Peach, from where she observes the games. It has the options of clay ground, grass ground, and also the regular tennis court layout. It also features a huge screen from which the live game is shown. On the sides of the court is the Nintendo logo. It has 3 courts, involving a Hard Court, Grass Court and Clay Court. All World Open and Star tournaments take place on this court. The special game Artist On the Court also takes place on this court.
A version of Peach Dome also appears in Mario Tennis: Power Tour as the only court to appear in the game that is also in the console version. However, it appears as if it has been changed to fit in with Peach's style, such as a pink and green colored court with hearts placed in and around it. The walls had been changed to blue and the sides of the court are yellow rather than grey. Oddly, while the seats are red during the cutscenes, the seats appear to be more orange than red during gameplay. This is the only court to be in Mario World. The court is used in Peach Tournament, and is unlocked for exhibition matches by completing the said tournament.
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