Goalkeeper Emiliano Martinez (left) stepped up as Argentina edged past Ecuador at Copa America. -AP
Goalkeeper Emiliano Martinez was the hero as Argentina beat Ecuador 4-2 on penalties to move into the semi-finals of the Copa America.
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Martinez stopped two spot-kicks for the reigning champions in the shootout after the teams fought out a 1-1 draw in Thursday's last-eight clash.
Superstar skipper Lionel Messi allayed concerns about a hamstring injury to start the game for Argentina.
In the 35th minute, the captain's corner was flicked on by Alexis Mac Allister for Lisandro Martinez to score with a header and give his side a 1-0 lead.
Ecuador skipper Enner Valencia hit the post from the penalty spot before Kevin Rodriguez scored a stoppage-time equaliser to force the shootout.
There is no extra time in Copa America knockout games apart from the final.
In the shootout, Messi clipped the crossbar with Argentina's opening effort, but Martinez saved Ecuador's first two spot-kicks before Nicolas Otamendi scored the decisive penalty to book a semi-final spot.
Argentina will face either Venezuela or Canada, who play on Friday (Saturday AEST), in the semi-final.
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