Sarmiento de Junín overcame All Boys in a close win on Friday, 1x0, in a match relating to the Grp.B of the Primera Nacional B.
The first-half ended with a goalless draw.
Fernando Nunez scored the winner after 52 minutes.
In the next fixture, Sarmiento de Junín visit Gimnasia de Jujuy. Meanwhile, All Boys will play at home against Deportivo Riestra.