A great tennis game with Sega mascots makes this title an easy game to recommend.
The roster of playable characters includes popular Sega mascots like Sonic, Ulala, Amigo and even Alex Kidd from the old-school Master System. Each of them have their strengths and weaknesses--for example, Amigo doesn't look the part, but he's a Power Player who hits about as hard as he shakes those colorful maracas. The old-school Sega songs are a nice touch for nostalgic gamers, and the court designs are wild and imaginative.
The mini-games are also a nice touch, but some of them are absolutely frustrating like the one for Jet Grind Radio where you must "get the perfect tag three times" (Trust me, play this mode and you'll know what I mean.) Many of them are quite fun and are a welcome distraction. And there are a ton of unlockables to be had, like new missions, songs and characters.
Overall, if you enjoy tennis games and happen to be a fan of Sega characters, there's no better choice of game than this.