Format
Each match-up was a two-team group stage. Because of the increase in participants, a preliminary group was implemented in the competition, with the rest following the previous season's format. Wins were awarded two points, 1 point for a draw, and no points for a loss. The team with the most points after a home and away game advanced to the next stage.
If the teams still remained tied, goal difference will become a factor. A one-game playoff would be implemented in case the teams are still tied. A draw of lots was to become the last solution to breaking a tie. Controversially, Independiente Santa Fe and Jorge Wilstermann tied on points which would have required a playoff; CONMEBOL, however, scraped the idea and decided that the last semifinal slot was to be given by a draw of lots which the Colombians won.
Read more about this topic: 1961 Copa Libertadores