The First Stage of the 2011 Copa Santander Libertadores de América football tournament ran from January 25 to February 3, 2011 (first legs: January 25–27; second legs: February 1–3).
Format
The twelve teams were drawn into six ties on November 25, 2010, in Asunción.[1]
Teams played in two-legged ties on a home-away basis. Each team earned 3 points for a win, 1 point for a draw, and 0 points for a loss. The following criteria were used for breaking ties on points:[2]