Premise: The 1991 Supercopa Sudamericana Finals were the finals of the fourth edition of the Supercopa Sudamericana football tournament. It was contested by Argentina club River Plate and Brazil club Cruzeiro . The first leg of the tie was played on November 13 at River Plate's home field, with the second leg played on November 20 at Cruzeiro's.
Hypothesis: The 1991 Supercopa Sudamericana Finals were the final edition of the Supercopa Sudamericana football tournament.