Morales sent his shot into the upper right corner and goalkeeper Roberto Abbondanzieri never had a chance as the Mexicans beat Argentina for the first time in 14 years.

In Saturday's other game, Uruguay beat Ecuador 2-1.

Referee Marcio Rezende called the free kick after Argentina's Luis Gonzalez brought down striker Jesus Arellano with a slide tackle from behind.

Argentina dominated much of the game, replicating the attacking style that lifted it to its opening six-goal victory over Ecuador, but couldn't get through Mexico's defense.

Mexico and Uruguay share first place in Group B with four points. Argentina trails with three, followed by Ecuador with none.