What, you mean you're counting Australia out?! lol
But seriously. They can beat Serbia. They've done it before.
Just need a big Germany win and a big Aussie win (can't see Ghana winning)...
Current standings...
1 Ghana 2 1 1 0 2 1 (+1) 4
2 Germany 2 1 0 1 4 1 (+3) 3
3 Serbia 2 1 0 1 1 1 (0) 3
4 Australia 2 0 1 1 1 5 (-4) 1