Fernando Vergara/Associated Press
Aguero was more than Costa Rica could handle.
Aguero is never going to be Argentina's dominant player as long as Messi is in form.
But Aguero has had his moments in the pale blue and white shirt, often at least partially attributable to his work with Messi.
Aguero posted a brace against Costa Rica in the 2011 Copa America group stage, leading Argentina to a 3-0 victory.
"Sergio Aguero scored in first-half stoppage time, and again in the 52nd minute following a pass from Barcelona star Lionel Messi, who showed his best form for the first time in the tournament," noted the ESPN FC match report.
Aguero did most of the heavy lifting for Argentina in those preliminaries:
"Aguero had scored Argentina's only other goal its opening two draws, making him the tournament scoring leader with three."