South Korea and Iran joined Japan and Australia in qualifying automatically, with the World Cup hopes of Jordan and Uzbekistan still alive
Iran and South Korea have secured their places at the 2014 World Cup in after a dramatic final round of matches in AFC qualifying.
After Australia secured one of the four Asian spots in Brazil by finishing runner-up in Group B behind Japan, Iran secured their fourth finals appearance thanks to a 1-0 win over South Korea in Ulsan.
Both Iran and South Korea required a victory to guarantee their progression, with Uzbekistan hoping to overtake the losers. With South Korea going into the game a point clear, a draw would have suited them but Iran's Reza Ghoochannejhad took advantage of some sloppy defending to seal his side's progression and put South Korea's spot in jeopardy.
However, they were reprieved by next to the narrowest of margin, as Uzbekistan could not secure the six-goal swing in goal difference they need to overtake South Korea, although it was not for a lack of trying.
Uzbekistan were left in the play-off place from the group after they beat Qatar 5-1, two goals shy of automatic progression to Rio de Janeiro.
The hunt did not begin well for them, despite being dominant, and they found themselves 1-0 down to their opponents after a goal from Abdulqadir Ilyas on 37 minutes.
The second half brought hope though, as substitute Bahodir Nasimov scored his first goal immediately after coming off the bench on the hour mark and grabbed his second 13 minutes later.
Oleg Zoteev also scored from the bench to make it 3-1 before Odil Ahmedov and Ulegbek Bakaev netted in the closing minutes, but it was not enough.
Jordan beat Oman to third place in Group B, thanks to a narrow 1-0 win, keeping alive their slim hopes of making the finals for the first time.
Oman only needed a draw to finish above their opponents, but the vital goal came from 21-year-old Ahmad Hayel Ibrahim, who has now scored seven goals for his country throughout the qualification process.
The winner of the play-off tie between Jordan and Uzbekistan will face the fifth-placed side in the CONMEBOL section, over two legs, for a spot in Brazil next year.