An extraordinary row between South Korea and Iran highlights the tensions in Asia’s World Cup qualifying ahead of Tuesday’s final group matches, with Australia also urging caution before trying to book their ticket to Brazil.South Korea, who lead Group A by a point, need only a draw to reach Brazil 2014 but victory for Iran would guarantee their fourth World Cup finals appearance. Third-placed Uzbekistan, two points behind Iran, must win in Qatar to stand any chance of automatic qualification.In Group B, Australia can join Japan, who have already secured qualification, in Brazil with a win over Iraq in Sydney. Oman, a point behind Australia in third, take on Jordan as they bid to snatch second place from the Socceroos.But South Korea and Iran, with 11 World Cup appearances between them, have added considerable emotional spice to their meeting with tit-for-tat barbs between their coaches and players.After Korean boss Choi Kang-Hee’s vow to “make life painful” for Iran drew a strong response from their coach Carlos Queiroz and captain Javad Nekounam, the home players launched a fresh salvo.”I will make him (Nekounam) shed tears of blood,” said Germany-based forward Son Heung-Min, while Choi vowed that Queiroz would be watching the…