AFP Sport looks at five things we learned from the opening round of group games at the Asian Cup in the United Arab Emirates: Home advantage counts It has been a long time since Iran or Saudi Arabia were kings of Asia but with the tournament back in the Middle East, they have looked in ominous form. Iran, Asia’s top-ranked team, swamped Yemen, the lowest in the competition at 135 on the FIFA listings, 5-0 in the biggest win of the first round. Iran haven’t lifted the trophy since 1976, when they completed a run of three straight victories — two of them on home soil. Three-times winners Saudi Arabia, who last won the title in UAE, a short hop over their shared border, in 1996, were also impressive in their 4-0 win over North Korea. After Jordan stunned defending champions Australia, and Uzbekistan became the only side from outside the region to beat a Middle Eastern team, it’s tempting to think that home comforts count for much. Don’t mind the gap Reputations increasingly mean little in international football but when Turkmenistan and the Philippines are playing the continent’s best, expectations are understandably low. However, a thunderous first-half strike put…