Spain have moved level on points with Portugal at the summit of Group B after edging past a spirited Iran side at the Kazan Arena.
A fortuitous Diego Costa goal helped Spain overcome a dogged Iran to secure a 1-0 win in their World Cup Group B clash in Kazan.
Carlos Queiroz's side produced a defensive masterclass to reduce Spain to nothing more than half-chances during a hugely frustrating opening 53 minutes for the 2010 champions.
Costa - who scored twice in Friday's pulsating 3-3 draw with Portugal - eventually found the breakthrough, though, when Ramin Rezaeian's attempted clearance cannoned off his leg and into the bottom-left corner.