Ezequiel Maggiolo and Carlos Luna scored twice apiece as Tigre thrashed Union Santa Fe 4-0 to put the pressure on Clausura leaders Boca Juniors.
Maggiolo opened the scoring after 17 minutes, then Luna netted just before the half-hour and on the stroke of half-time as the game was effectively killed off in the first period.
Maggiolo bagged his second seven minutes after the restart as Tigre pulled level on points at the summit with Boca, who face Atletico Rafaela on Sunday.
Arsenal Sarandi went fourth, two points off the leaders, with a 3-1 win over Independiente.
The hosts led 3-0 by half-time thanks to strikes from Guillermo Burdisso and Emilio Zelaya, which sandwiched a Gabriel Milito own goal.
Facundo Parra pulled one back after 69 minutes but any hopes of a comeback were killed off with the dismissal of Julian Velazquez three minutes later.
The win allowed Arsenal to overtake Velez Sarsfield, who slipped to a 2-0 defeat at home against Argentinos Juniors.
The goals came from Santiago Naguel in the 52nd minute and Pablo Hernandez from the spot seven minutes from time.