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.
Photos: Kareena Kapoor Khan and Aamir Khan at Mumbai airport
Photos: SRK, wife Gauri, Aishwarya Rai, Shweta Bachchan at Vogue Awards
Photos: Harbhajan Singh-Geeta Basra's TV outing with daughter Hinaya
Photos: Malaika Arora flaunts ripped jeans like a boss!
Photos: Vaani Kapoor, Kriti Sanon, Dia Mirza sizzle on the ramp