Iran and Nigeria played out the first draw of the 2014 World Cup as their Group F opener ended goalless.
Nigeria dominated possession but created few chances against a disciplined side managed by ex-Manchester United coach Carlos Queiroz.
The Super Eagles' best opportunities came in the first half, when Ogenyi Onazi fired a yard wide before Ahmed Musa went close with a free-kick.
Iran's Reza Ghoochannejad forced a great save from Vincent Enyeama.
"The decision making in the final third when Nigeria managed to get there was poor. They made the wrong choices. The quality of the balls into the box was poor and they didn't play to their strengths.
"This is the game they should have wanted to go out and win and you would think there would be more urgency in their play."
The share of the points leaves both teams well placed in the group after Argentina defeated Bosnia-Hercegovina.