While Racing edged to the top of the table on goal difference, Torneo Inicial champions San Lorenzo started the new campaign with a 2-0 loss away to Olimpo, while Copa Sudamericana champions Lanus needed a sublime second-half finish from Ismael Blanco to draw 2-2 at Belgrano.
Racing got their season off to a flying start with a stunning opening goal of the season from Valentin Viola.
The 22-year-old striker unleashed a bicycle kick to send Diego Villar's cross past Colon goalkeeper German Montoya in the 38th minute on Saturday and Racing led 2-0 at half-time after Gabriel Hauche burst away in stoppage time to finish from a tight angle.
In the final game of the round on Monday, Lanus led early but had to come from behind in the second half to earn a point at Belgrano's Estadio Mario Alberto Kempes.
The hosts hit the front in the 40th minute thanks to a penalty from Luciano Lollo but Lanus eventually claimed a draw when Blanco ran onto Victor Ayala's pass with 14 minutes remaining, before delicately chipping the ball over Juan Olave to make the score 2-2.
In other results, Velez Sarsfield were held to a 0-0 draw by Tigre, Atletico Rafaela came from behind to draw 1-1 with All Boys and last season's Torneo Final champions Newell's Old Boys played out a scoreless stalemate with Boca Juniors.
