Jubilant Greece coach Otto Rehhagel described the 2-1 victory over Portugal in the opening game of Euro 2004 as the biggest win in Greek soccer history.
"This is the biggest win of any Greek team ever," he said.
"The tactics we chose over the past week have been extremely successful. I hope that the Greeks will hang their flags outside their houses.
"We will be a little bit happy now but then we have to focus again because we play our next game in four days."
Giorgos Karagounis, who scored the first goal after just seven minutes, said they had taken advantage of a nervous display by the hosts.
"We've achieved something totally unknown to us," he said.
"They were nervous and we managed to capitalise on that, but we don't stop here. You don't get through with just three points."
In Athens, many celebrated the victory by sounding car horns and throwing firecrackers.
"It was a dreamlike start for our team," said Greece and Bolton midfielder Stelios Giannakopoulos.
"Who could imagine that in the first game we would get our first ever three
points in such a competition against Portugal - one of the soccer superpowers."
Defender Mihalis Kapsis said the victory would boost his side's confidence.
"This victory doesn't make us some great soccer power but it shows that we didn't get here by chance," he said.