Mario Tennis Power Tour is a very good game, that has A LOT for you to do, and rarely ever gets boring
User Rating: 8.8 | Mario Tennis: Power Tour GBA
The Good: I have one word for this game… wow! This game is very good. I found this game to be a great tennis game because it stands out in many unique ways. This game did a great job, because you actually need to train to be a good tennis player. In most tennis games, all you need to do is press a few buttons to win the tournaments that are thrown at you. Seriously, not only can you practice by playing matches, you can train at the tennis machines, and even the machines in which you increase your speed, or simply just talk to people for some great advice. There are also many characters that you need to unlock. It’s incredible! The graphics are fairly good too. There is a lot for you to do, because the tournaments all take some time to beat, and actually require some kind of experience.
The Bad: Tennis tournaments may get boring after playing so many. The graphics are only alright, not the greatest even for the game boy advance. The other game modes besides the story are all fairly boring, at least, after you have used all of the unlockable characters.
Basically, if you want a good sports game for the GBA, get this one, and also consider Mario Golf Advance Tour, it's a game a lot like this one. 
