All cheats for this game by platform:
GameBoy
Downloadable Tennis Cheats
Primary Collection of Cheats
1 set matches
Press [A] + [B] + [Select] + [Start]
at the title screen when selecting a one player game.
Quick victory
During a serve, throw the ball up and position your
player directly underneath in order to have the ball land on your
head. This will result in a point in your favor. Repeat this to
win the match.