It is the first time Iran has qualified for consecutive World Cups, and will be its fifth appearance at soccer's marquee tournament.

Sardar Azmoun scored in the 23rd minute and Mehdi Taremi in the 88th at Azadi Stadium in Tehran.

Iran, managed by former Real Madrid and Portugal coach Carlos Queiroz since 2011, tops Group A of Asian qualifying. The team is unbeaten from eight games and eight points clear of third-placed Uzbekistan with two qualifiers remaining.

They cannot be denied a top-two finish and an automatic spot in Russia next year.

South Korea is in second place, a point ahead of Uzbekistan with a game in hand.

Iran is yet to concede a goal in qualifying in a run which has renewed the confidence with fans.

Vice-president Eshaq Jahangiri was present at the stadium for the game, among the almost 60,000 supporters celebrating when the referee blew full-time.

The Iranian players celebrated with the national flag, broadcast live on TV with a rousing soundtrack. Men, woman and children spilled into the streets with flags and chants and motorists honked their horns.

In the main streets and squares Tehrani residents gathered and chanted "Queiroz, we love you," and "Queiroz, thank you."