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These underdogs won the previous European Championship, and back then, no one considered them among the favorites either.
Lightning strikes twice, but rarely. The Greeks' highly controversial championship severely damaged the prestige of UEFA, so much so that at the 2006 World Cup, European giants allowed no upsets (I don't consider the Czech Republic's defeat against Ghana an upset). And the Greeks weren't even there – the champions failed to qualify.
Now, the Greeks are the same slow team, four years older and no longer scoring from set pieces. A dream opponent.