From the Super Mario Wiki
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The Night Court is a tennis court that appears exclusively in Mario Sports Superstars for the Nintendo 3DS. As its name suggests, the Night Court takes place at night, this having a dark sky and lights throughout the court. The ball speed is described as four stars while bounce is described as two, which is the equivalent to the Composition Court from previous Mario Tennis titles, as well as Peach's Palace from Mario Tennis Open. The Night Court is unlocked by beating the Star Cup, and is also the court used on the Champion's Cup.