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 on Wednesday evening.
READ: Costa fires Spain past Iran
The win moves Spain level on points with Portugal at the top of Group B and they know victory against Morocco on Monday will be enough to secure qualification for the knockout stages. Iran, meanwhile, face Portugal on the same day needing a win to progress at the expense of Cristiano Ronaldo and Co.