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These add-ons are completely unnecessary.

Unless you want to play actual tennis with Wii-motes or something, then you would look like a complete douchebag using this stuff. Don't mean to sound like an asshole or anything.

Would people really buy this stuff though? Well, maybe that 40 year old mom I saw at EB buying Game Party or something for Wii would buy this lol.

It is pretty neat though.