The Argentines are now just three points clear of sixth-placed Venezuela, who beat out-of-sorts Paraguay 2-0 in Asuncion.
There was little consolation, though, for reigning continental champions Uruguay who, after their crushing 4-0 defeat by Colombia on Friday brought an 18-match unbeaten run to an end, with a tame 1-1 draw to Ecuador in Montevideo.
Colombia, on the other hand, go from strength to strength, wresting second place in the group from Chile with a commanding 3-1 victory in Santiago and are now just a point off the lead and level on points with Ecuador.
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