(Betcha thought the Japanese would have a more interesting nickname.)
Australia is making just its second appearance in a World Cup. They made it in 1974 when the World Cup was also held in Germany. They lost two and played a scoreless tie then and did not score a goal. Australia beat Uruguay in a home and home playoff to earn its spot.
Japan is appearing in its third straight World Cup, the same number of overall appearances. After going 0-3 in France in 1998, the Japanese used the home field advantage to get to the second round with wins over Russia and Tunisia before losing to Turkey.