In pictures: Spain edges past tenacious Iran

Diego Costa's 54th minute strike helped Spain to victory over Iran after Saeid Ezatolahi's equalizer was ruled out for offside.

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Lucas Vazquez started ahead of Koke in the attack and Dani Carvajal replaced Nacho in defence for Spain.(Getty Images)

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Iranian fan enjoys the atmosphere in Kazan Arena ahead of the kick off between Spain and Iran.(Getty Images)

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Diego Costa scored his third goal of the tournament, now stands one goal behind club rival Cristiano Ronaldo for the Golden Boot.(Getty Images)

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Iranian keeper Ali Beiranvand makes an acrobatic save to keep David Silva's shot out of the goal.(Getty Images)

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Referee Andres Cunha awards goalkick to Spain after Iran's Saeid Ezatolahi was deemed offside while scoring the equalizer.(Getty Images)

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Sergio Ramos and Gerard Pique celebrate Spain's win after full-time whistle. The win puts Spain on verge of qualifying for the Round-of-16 alongside Portugal.(Getty Images)

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Lucas Vazquez started ahead of Koke in the attack and Dani Carvajal replaced Nacho in defence for Spain.(Getty Images)