ABU DHABI, United Arab Emirates (AP) South Korea, Australia and Japan have all made it through to the quarterfinals of the Asian Cup knowing there is much room for improvement as the continental tournament enters its finals stages.

Even with the arrival of Son Heung-min from Tottenham, Korea struggled to get past Bahrain, ranked 60 places lower by FIFA at 113, in Tuesday's second round game in Dubai. It needed an extra-time goal from Kim Jin-su to settle the encounter and book a quarterfinal with Qatar.

"It was a tough game."Son told reporters. "It's all about attitude as well, and I'm a bit unhappy with our performance. I think we're better than that."

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