Calzaghe v Tarver - Who would have won.?

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My money would have been on calzaghi

one route to look at is calzaghi convincing beat hopkins and hopkins convincingly beat tarver

Calzaghi was extremely fit, threw too many punches for tarver and in his prime had a solid chin

Also, with Tarver being a fellow southpaw would Calzaghe have had an even easier time with him?