Nigeria and Iran delivered the first draw of the World Cup as they ground out a scrappy 0-0 stalemate in their opening match in Group F.
The draw at the Arena da Baixada in the southern Brazilian city of Curitiba followed 12 mostly high scoring and attacking games.
After a first half in which Nigeria failed to capitalise on its dominance, chances were few and far between in the second.
In the early passages of play, Nigeria had shown menace, with much of their attacking thrust coming down the left with Emmanuel Emenike and Victor Moses combining to cause problems for the defensively-minded Iran side.
Nigeria came closest to scoring in the seventh minute when an Ahmed Musa goal was disallowed after John Obi Mikel was adjudged to have fouled Iran goalkeeper Alireza Haghighi at a corner.
Iran's confidence grows
Iran grew more confident as the game progressed and came close to scoring in the 34th when a Reza Ghoochannejhad header required a sharp save from Nigeria goalkeeper Vincent Enyeama.
In the second half, both sides were guilty of sloppy passages of play, to the growing annoyance of the mainly Brazilian crowd.
Both sides must now look to beat tournament debutant Bosnia-Herzegovina in a group that most expect to be won by Argentina. Lionel Messi scored one of the tournament's best goals in Argentina's 2-1 victory over the Bosnians.
The result will be a disappointment for Nigeria, the current Africa Cup of Nations champion. Following a long slump, the team had been showing signs of some of the flair and power that had marked the country's football in the 1990s.
The draw means the winless World Cup runs of both teams continues, dating back to France 1998. For Iran, though, this was the first time they had not conceded a goal at the World Cup finals.