Colon Santa Fe are a point clear at the head of the Clausura after a 1-0 win over All Boys on Wednesday.
The home side left it late to secure the points, with Lucas Landa scoring with eight minutes left.
Prior to that All Boys had lost Juan Careaga to a 54th-minute red card and after it Carlos Luque was sent off for Santa Fe.
Boca Juniors continue to struggle in the lower reaches of the table, losing 2-1 at Rosario Central.
They took the lead through Emanuel Gigliotti (14) but were pegged back by Franco Niell (72) and Alejandro Donatti (76).
Godoy Cruz are third in the table after a 1-0 win over Lanus. Mauro Obolo scored the only goal from the penalty spot 17 minutes in.
The day's other game saw Racing Club share six goals with Estudiantes in a thrilling 3-3 draw.
Racing had the game under control, lost it and then grabbed a point in injury time.
Esteban Saveljich opened the scoring for them (two) then Estudiantes levelled through Guido Carrillo (16). Racing went back in front through Rodrigo De Paul (61) but then trailed as Juan Manuel Olivera (79) and Patricio Rodriguez (85) swung the affair in the visitors' favour.
Gaston Campi made a point for the home side, though, scoring in injury time.