From the Super Mario Wiki
The Banana Cup is comprised of four courses, each of which is taken from previous Mario Kart games, specifically from the Mushroom Cup, Flower Cup, and Star Cup. The cup's symbol is a Banana Peel, and the cup's tracks are slightly more difficult and/or longer when compared to those of the Shell Cup. Its length and difficult is on par with the Flower Cup.
Mario Tennis Open
In Mario Tennis Open, the Banana Cup is the third cup in the World Open series. It is played on the DK Jungle court. This cup can be unlocked by beating the Flower Cup, and once beaten will unlock the Champions Cup. The CPU difficulty is one step harder than that of the Flower Cup's.
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