Holder Japan held off Iran to pick up the point it needed to finish top of Group D after a 0-0 draw at the Asian Cup in Chongqing on Wednesday evening.
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Japan topped the group on seven points following wins over Oman and Thailand with Iran two points behind. Oman's slim chances of reaching the last eight ended despite a 2-0 win over Thailand in Chengdu.
Zico's men survived intense second-half pressure from Iran after the interval but held steady in sweltering conditions thanks to solid defending and a series of important saves from Yoshikatsu Kawaguchi.