Santiago Silva scored from a second-half penalty to move Velez Sarsfield level on points atop the Argentine Apertura football standings Sunday after a 2-1 home win over River Plate.
Juan Manuel Martinez opened the scoring for Velez in the 33rd minute before Diego Buonanotte equalized for River in the 41st. Silva was fouled in the box and hit the winner from the ensuing penalty for the decisive goal in the 59th.
Velez defender Leandro Somoza was sent off after receiving a second yellow card in the 73rd minute.
The win put Velez level with Arsenal on 12 points atop the table. San Lorenzo is third, a point behind the leaders.
Elsewhere, Huracan won 2-1 at Quilmes, Lanus beat Gimnasia 2-0 away and 10-man Banfield drew 1-1 at home with Tigre.
Martinez gave Velez the lead over River after receiving a right-wing cross from Ivan Bella inside the box and firing past goalkeeper Juan Carrizo.
Buonanotte scored against the run of play to pull River level. Roberto Pereyra rode challenges on the right side and forced the ball to Buonanotte, who volleyed a shot past Marcelo Barovero from the edge of the box.
Velez continued to look the more potent of the two sides in the second half and took the lead when Jonathan Maidana clipped Silva's heels as the Uruguayan striker looked set to score from Martinez's square pass.
Replays suggested Maidana was lucky to escape with just a yellow card, but Silva made sure justice was done, sending Carrizo the wrong way with a low penalty to the right.
Somoza was sent off with almost 20 minutes still to play, but River was unable to mount a comeback despite the numerical advantage.
In Sunday's earlier matches, Ruben Ramirez was sent off for Banfield after an hour of the match against Tigre.
Ramiro Leone gave Tigre the lead in the 83rd minute, but Sebastian Romero pulled 10-man Banfield level four minutes later.
Elsewhere, Mario Regueiro and Silvio Romero scored second-half goals as Lanus won at relegation-threatened Gimnasia.
Santiago Hirsig gave Quilmes a quickfire opening goal with a strike in the first minute against Huracan, but goals from Carlos Quintana and Luciano Nieto after half time helped the visiting team to victory.
In results from Friday and Saturday it was: Godoy Cruz 1, Estudiantes 2; Racing Club 1, Colon 2; All Boys 1, Olimpo 0; Boca Juniors 1, San Lorenzo 2; Arsenal 1, Argentinos Juniors 0; Newell's Old Boys 1, Independiente 1.
