Arsenal Sarandi missed the chance to go second in the Apertura table as they were held to a 2-2 draw at Racing Club.
Arsenal went 1-0 up after 18 minutes through Mauro Obolo, and it stayed that way until 17 minutes from the end when Pablo Luguercio levelled.
Cristian Alvarez re-established the lead five minutes later but Racing got a second equaliser with five minutes to play through Lucas Aveldano.
Two goals in the last five minutes from Santiago Gentiletti and Ciro Rius gave Argentinos Juniors a 2-0 win at Boca Juniors.
Elsewhere, Antonio Aguero scored the only goal as Gimnasia La Plata edged Quilmes in their bottom-of-the-table clash, while Godoy Cruz and Newell's Old Boys played out a goalless draw.