Maxi Rodriguez scored a first-minute goal to help Newell's Old Boys beat Velez Sarsfield 1-0 on Sunday and hold on to first place in the Argentine first division.
The former Liverpool player scored after just 26 seconds and Newell's held on to improve to 22 points from 10 matches, two clear of Racing Club and three ahead of Belgrano.
After scoring his first goal since returning to Newell's, he kissed the logo on the team's shirt to coax wild cheers out of local fans.
Belgrano defeated Boca Juniors 3-1 on Sunday and Racing was a 1-0 winner over Colon on Saturday.
Boca's loss will put more pressure on coach Julio Falcioni. Santiago Silva gave Boca a lead in the third minute, but Belgrano hit back with Sergio Rodriguez's strike in the 22nd, and two more in the second half from Victor Aquino and Guillermo Farre.
Boca's Christian Cellay was sent off in the 68th.
In other results Sunday, River Plate beat Godoy Cruz 5-0 and Independiente defeated Rafaela 2...