The equalizer came four minutes later after Gylfi Sigurdsson's rasping effort forced a lunging save from Caballero. The rebound fell to Finnbogason, who hammered in from close range.

Despite Argentina's control of possession, Iceland looked more likely to score.

Sigurdsson twice had chances to give his side the lead just before halftime: first with a 15-yard strike that again tested Caballero and then by flashing a volley narrowly wide.

Sevilla midfielder Ever Banega replaced Lucas Biglia in the 54th minute and the change made an immediate impact as Iceland were pushed deeper.

Messi also became more influential. It was his inviting cross into the area that led a disorientated Hordur Magnusson to clatter into Maximiliano Meza. Polish referee Szymon Marciniak pointed to the spot and the scene seemed set for another Messi rescue story for his country.

But the five-time Ballon d'Or winner appeared to hesitate before prodding a tame spot-kick that was parried away by Halldorsson.

Messi had further chances to score as Argentina pressed relentlessly in the final minutes. The No. 10 sent a free-kick over the bar and lashed long range attempts with either foot just wide of the target.

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