You've spent a sweaty summer afternoon on the tennis court wishing you could face off against AiAi from Super Monkey Ball instead of your slightly out of breath Dad, right? Of course you have! Well, now SEGA is giving you the chance.SEGA has, let's face it, one of the most revered catalogues of intellectual property in the games industry. Now, it does to the tennis game what Nintendo has done for the beat 'em up with Super Smash Bros. Brawl. Namely, it has brought together its best know characters in one place to face off against each other (obviously they use tennis rackets instead of fists and weapons!)Players will find 15 playable SEGA characters up for grabs, including Sonic the Hedgehog, AiAi from Super Monkeyball fame, Ulala of Space Channel 5 and Amigo from Samba De Amigo.They'll square off in areas like the Green Hill Zone or Amigo's Carnival Park. You won't just find yourself knocking balls back and forth between different SEGA characters, however. You'll also need to get stu