From the Super Mario Wiki
Serve Already! is one of Kat and Ana's microgames in WarioWare: Smooth Moves. When playing the game, the player has to use "The Remote Control" form in the first and second level and "The Sketch Artist" form in the third level.
During this microgame, the player must bounce a ball off a racket until the time runs out. If the ball hits the ground, the game ends in a loss.