Torneo Apertura leaders River Plate were held to a 1-1 draw in your own home a great Olimpo side who finished with 10 men on Sunday.
Ramiro Mori gave River a first-half lead but half-time substitute Miguel Borja equalised as well as the dismissal of Ezequiel Parnisari could not prevent Olimpo securing for a point.
Godoy Cruz and Estudiantes also shared a single-1 scoreline, Leandro Desabato earning the second a draw after Leandro Fernandez gave Godoy an earlier lead.
Newell's Old Boys won 2-1 at Tigre, with all the current goals being released the 1st half.
Maximiliano Rodriguez's opener was cancelled out by Joaquin Arzura but Victor Lopez netted the winner and Newell's held on despite the second-half sending-off from Milton Casco.