Following a thrilling 3-3 draw to Portugal on Friday, Spain will look to bounce back against an Iran side high on confidence after their late win against Morocco.
In the first half, Iran played well and defended strongly and Spain could not score however they dominted the majority of the contest.
Saied Ezatolahi thought he'd equalised midway through the second half but, to Spain's relief, the goal was chalked off for offside.
Spain will end their Group B campaign against eliminated Morocco on Monday, while Iran face Portugal, where only a win would be enough to secure them a place in the round of 16. "Best world Cup ever without a doubt." added another.
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Senegal will be playing in honor of Bruno Metsu, their late coach who led them to the quarterfinals back in 2002. The Senegal midfielder passed to Gueye, whose right-footed shot from the arc headed toward Szczesny's far post.
It was to little avail though as time eventually ran out and Iran suffered their first loss of the tournament. He also has nine goals in his last nine starts for Spain.
The Manchester City midfield orchestrator was everywhere and at the heart of La Roja's dominance on Wednesday night, but it took Spain time to breach Iran's considerable resistance as they always had 10 men behind the ball. The Atletico Madrid striker showed his individual class and poaching instincts with both goals and will be charged with breaking the deadlock against a mean Iranian defence. In the more likely situation that Spain secure victory, they will enter their final group encounter in a much more comfortable position for reaching the first knockout rounds. Whose side are you as the Spaniards take on the Iranians?
Iran kept a firm head on all fronts, despite David Silva's attempted volley that sailed over the crossbar after 30 minutes.
The FIFA World Cup 2018 Iran vs Spain match will be played at the Kazan Arena, Russia.