Answer
The brawl involved Paraguayan goalkeeper José Luis Chilavert and Colombian forward Faustino Asprilla during a 1997 Copa América quarterfinal match between Paraguay and Colombia. The incident occurred after Chilavert allegedly spat on Asprilla, who responded by headbutting the goalkeeper, leading to both players being sent off. The heated rivalry between the two players had been simmering for some time, and this incident further intensified their animosity.