Small screen hurts the gameplay
Gameplay wise, I would sometime get very frustrated with this game because it's on a screen that is so small. Trying to see where the tennis ball is heading so that you can run to it can be problematic since the ball is even smaller. This is also true when you try to position your player so that he can hit better. I dont have a manual so I dont know for sure how to control where the ball is heading. I figured pressing the side directions while i swing my racket would do the trick and it sometime does but other times it doesnt seem to do anything. This makes it hard for me to win matches since I dont control the ball.
What I really liked about this game was the A.I. in some of the players matched their play style. Pick someone that is good in singles to play double with you and he will try to hog all the ball, forcing you to switch sides constantly with him to cover your court.
Overall, I would think this game makes a good adition to the GBA. It's not the greatest and best of tennis games but it's something that someone can play standing in line.