Hm, great game, don't know how Australia won that 3-1 though. In the end I think they got the rub of the green. In my opinion the goal Japan scored was a good one, but given the standards today the Aussies were certainly unlucky not to have it ruled out, but that was a definite penalty at the end there, no doubt about it. Australia pressed well, though Japan had plenty of opportunity to kill that game off and wasted the ball when they had it in good positions and must be kicking themselves now.
Australia are now in a great position to go through to the second round as long as no one springs a surprise result against Brazil.