Atletico Rafaela climbed up to third in the Clausura standings thanks to a 1-0 win at home to Boca Juniors on Thursday.
Rodrigo Erramuspe grabbed the only goal at the Estadio Nuevo Monumental to make it two wins and a draw from Atletico's first three games. Boca, by contrast, have taken just a single point from their three games so far.
Rosario Central are fourth after a 3-1 home win over Gimnasia La Plata.
Matias Garcia gave the visitors a seventh-minute lead but Rosario fought back. Alessandro Donatti (26) levelled the scores before Federico Carrizo edged them in front in the 65th minute. Walter Acuna's goal made sure of the win in the final moments.
Belgrano maintained their unbeaten start to the season with a 1-1 draw at home to Newell's Old Boys.
Maxi Rodriguez put the visitors in front with a 62nd-minute penalty but Gabriel Heinze's own goal six minutes later brought Belgrano back into the game. Newell's have drawn two and lost one of their three games so far.