Facundo Ferreyra scored the winner, his second of the game, as Velez Sarsfield beat San Lorenzo 2-1 to remain top of the table in the Argentinian Apertura.
Ferreyra opened the scoring for the visitor after 14 minutes but Denis Stracqualursi equalised 12 minutes later.
The game looked to be heading for a draw but Ferreyra netted the winner with 24 minutes to go.
Marcos Figueroa scored a hat-trick as Argentinos Juniors drew 3-3 with Union Santa Fe.
Figueroa scored after 18, 30 and 55 minutes but goals from Diego Jara (52), Diego Barisone (83) and substitute Pablo Magnin (90) made sure Union Santa Fe got a share of the points.
Ivan Borghello opened the scoring for All Boys after 68 minutes but Independiente earned a draw when Ernesto Farias equalised with six minutes to go.