Highlights - Germany 4-0 Australia
Australia midfielder Tim Cahill broke down in tears after describing his harsh dismissal against Germany as "one of the saddest moments of my career".
The Socceroos were 2-0 down when Cahill was shown a straight red card for tackling Bastian Schweinsteiger, with the Germans going on to win 4-0.
And the dismissal proved too much for Cahill when Schweinsteiger told him he should not have been sent off.
"Dreams can be made and crushed in the space of hours," said the Everton star.
"To hear Schweinsteiger say that, it's very nice of him to say it wasn't a red card.
"It's one of the lowest points of my career but this is the beauty of football. One day you are a hero, the next day you are at the bottom."
Cahill, who will miss Saturday's game against Ghana at the very least, said he tried to avoid contact when it was apparent he was not going to reach the ball and that his 56th-minute tackle was merely the result of a desire to change the game's pattern.
Cahill sees red against Germany
"My leg stayed bent all the way. Never once did I try to straighten it. What do you want me to say?" stated Cahill, 30.
"A lot of credit goes to the German team and for us, it makes it worse. I feel that maybe that decision changed the game, even though we were 2-0 down, I felt the momentum was with us."
Australia coach Pim Verbeek conceded his side had been outplayed, although he refused to criticise the referee for Cahill's red card.
Germany took the lead through Lukas Podolski and were 2-0 up by half-time when Miroslav Klose's header earned him his 11th World Cup goal.
"We were outplayed," added Verbeek. "The way we handled the game was definitely not good. We were disorganised.
"We didn't play the way we need to in order to challenge. Germany are one of the candidates to win the World Cup."
Further goals by Thomas Mueller and Cacau sealed an impressive display by the young German team and Verbeek conceded Cahill's mishap made it impossible to launch a comeback.
"They showed they have a better team, they are much stronger than in the past," commented Verbeek.
"In the second half, I thought we did much better but when you have a player sent off then it becomes very difficult."
The Dutchman added: "I don't talk about referees. "I didn't see the replay but I have seen a lot of yellow cards today and I didn't think it was a harsh game."