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The Australian team is tougher than both India and Sri Lanka in performance and they can be the worst nightmare for many teams I guess. Pakistani team isn't doing well in past few matches but if they improve their gameplay then surely they'll give a tough time to Australian team.
How do you assume Australia as a tough opponent when they started the world cup with two losses, once against India and one against South Africa, not even the die hard fans of Australia are not giving them any chance to reach the semi finals.
India and New Zealand are the favorites coming into this world cup and they are proving their worth and the next match between these two teams will be the interesting match up everyone is waiting to see.