With Newell's having moved three points clear at the summit on Sunday (AEST) thanks to a 3-1 victory over Union Santa Fe, Julio Cesar Falcioni's side was looking to respond but could find no way through the Velez defence.
The host's cause was not helped by the dismissal of Facundo Roncaglia four minutes before half-time. The visitor could not capitalise on its man advantage but moved up a place to sixth with the point.
Third-placed Tigre was also held to a draw, 1-1 at Colon Santa Fe, after playing for three quarters of the match a man down.
Carlos Luna secured the point with a 13th-minute leveller after Sebastian Prediger had put Colon ahead in the first minute. Tigre defender Lucas Orban saw red in the 22nd minute but there were no further goals.
Elsewhere, Jose Morales netted an 89th-minute winner as Argentinos Juniors edged Racing Club 2-1 to climb to ninth.
The game looked to be heading for a draw after Juan Ramirez's early opener for Argentinos was swiftly cancelled out by Valentin Viola, but Morales had other ideas.
The host had Sergio Escudero sent off in the dying seconds but there was no time for Racing to find an equaliser.
Finally, early goals from Diego Braghieri and Mariano Pavone earned Lanus a 2-0 triumph over Banfield, Facundo Ferreira's late effort proving scant consolation for the second-bottom visitor.