River lose 1-0 at home to Racing; Newell’s go top; Lanus beat Boca 2-0

River Plate 0 – Racing Club 1 (Primera Division, September 23, 2012) Cahais scored the only goal of the game with a powerful header from 10 yards.

Colon 1 – Newell’s Old Boys 2 (Primera Division, September 23, 2012) Nacho Scocco gave Newell’s the lead after 13 minutes and Marcos Caceres extended the advantage just after the hour. Lucas Mugni scored what turned out to be a consolation for Colon with 18 minutes to go.

San Martin San Juan 4 – Quilmes 0 (Primera Division, September 23, 2012) Gaston Caprari, Humberto Osorio, Jorge Luna and Sebastian Penco scored for San Martin San Juan in the 4-0 defeat of Quilmes.

Lanus 2 – Boca Juniors 0 (Primera Division, September 23, 2012) Mario Regueiro opened the scoring for Lanus after 33 minutes but was then sent off with seven minutes to go. Five minutes later Diego Valeri secured the three points for 10-man Lanus who moved up to mid-table with the win.