Argentina won Nigeria 94-66 in The Rio Olympic debut Game as Facundo Campazza scored 19 points on 5-of-8 shooting from three-point territory.
Manu Ginobili of the NBA's San Antonio Spurs added 12 points and the Brooklyn Nets' Luis Scola 18 as the more experienced Argentines proved too much for the sloppy African qualifiers.
Argentina is the only country since 1988 to have won an Olympic basketball gold medal other than the USA.
In Athens 2004, They won due to the strength and quality of their "golden generation" of core players which includes Ginobili, Scola and Andres Nocioni.
The team was Cheered on by the fans from their nearby homeland, which borders on Brazil, Argentina jumped out to an 11-0 lead.
They never looked back, using tough defence and superior ball movement to set up eight first-half three-pointers and take a 50-31 halftime lead.
More of the same followed in the second half, with the Argentines cruising to the final buzzer. They finished with 15 three-pointers.
The Nigerian Team was led by Ikechukwu Diogu's 15 points and 13 rebounds, and 14 points from Ebi Ere.