Julio Furch netted a pair of goals in the final 15 minutes on Saturday as Arsenal came away with a 2-1 win over nine-man San Lorenzo to move within three points of first place in the Apertura table.
After a tightly-played first half, things went south for San Lorenzo rather quickly as Leandro Navarro was sent off three minutes into the second half and Santiago Gentiletti was given his marching orders in the 64th minute, reducing the visitors to nine men.
Despite being down two players, San Lorenzo managed to strike first in the 73rd minute through Ignacio Piatti, but they couldn't hold the lead as Furch tallied in the 75th minute and collected the winner in stoppage time to move Arsenal to 23 points from their first 11 matches this season.
The club also maintains its unbeaten start with six wins and five draws thus far.
Elsewhere in Argentina, Alan Alegre netted the only goal of the match in the 28th minute to lift Quilmes to a 1-0 win over Belgrano, while Diego Ferreira scored just past the half-hour mark to secure three points for Atletico Rafaela in a 1-0 result over nine-man Argentinos Juniors.
In Saturday's final match, All Boys and Colon battled to a scoreless draw.
Sunday's action saw Newell's maintain the top spot in the league after Vctor Lopez's stoppage-time winner lifted the club to a 1-0 result against River Plate, while Emmanuel Gigliotti and Sebastian Abreu exchanged goals as Boca Juniors and Rosario Central played to a 1-1 draw.
Paulo Rosales and Ezequiel Cerutti scored in a six-minute span to lead Olimpo to a 2-1 win over Velez Sarsfield, while a Jose Luis Gomez own goal proved to be the difference as Estudiantes claimed a 1-0 win over Racing.
Monday's action saw Lucas Licht and Matias Perez Garcia exchange first-half goals in Gimnasia LP's 1-1 draw with Tigre while Jose Luis Fernandez notched the lone goal in Godoy Cruz's 1-0 defeat of Lanus.