River Plate beat San Lorenzo 4-0. San Lorenzo played with ten from minute 19. Medina Bello scored 2 goals.

1. 0'
   ⚽Kick-off
   Primera División 1990/91
   Referee: PasturenziAttendance: 7,564
2. 1. First half
   2. 19'
      ARG
      Red card
      CACastro
   3. 23'
      ARG
      GOOOAL!RCR. Castillo
3. 1. Second half
   2. 72'
      ARG
      GOOOAL!MBMedina Bello
   3. 79'
      ARG
      GOOOAL!RSRubén Fernando da Silva
   4. 81'
      ARG
      GOOOAL!MBMedina Bello