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Japan's shock defeat to Iraq and South Korea's late draw with Jordan make it harder than ever to predict who will lift the Asian Cup as the group stage approaches its climax.

Japan were favourites heading into the tournament to win a record-extending fifth title, while Son Heung-min's South Korea were touted as their chief challengers. But after early results in the group stage in Qatar generally went as expected, there was a major upset when Iraq defeated a strangely muted Japan 2-1.