Galaxy Arena

Galaxy Arena is a galaxy-based court in Mario Tennis Open. It is very similar to Super Mario Galaxy, as there are disappearing green platforms, a Launch Star, Star Bits, a planet from the Gateway Galaxy, a Black Hole, Red and Green Lumas, and the whole Comet Observatory in the distance. The special game Galaxy Rally is played on this court, where the Launch Star pieces appear on the court, and the player needs to collect them by hitting the tennis ball at them. It is an unlockable stage, and it can be unlocked by completing the Final Cup on the Star Open Tournament.

The unlockable stage has differences to the one played in Galaxy Rally; it lacks disappearing green platforms and it takes place in an another location. There are two varieties to this court: the Morph and the Crystal court. The Crystal court plays normally, but the Morph court has an added gimmick. When a player performs a chance shot, and if the chance shot does not get rallied, the type of floor on the opponents court changes to various patterns which affect ball velocity. A unique floor, a black hole pattern, erratically alters the direction of the ball bounce into one extreme direction. Only one part of the court can get altered: the player must perform a chance shot to change the pattern in the opponents court and the player must perform a chance shot to remove the court's current pattern.