Unión beat Platense 1-0. Platense played with ten from minute 26.

1. 0'
   ⚽Kick-off
   Primera División 1990/91
   Referee: CrespiAttendance: 1,188
2. 1. First half
   2. 26'
      ARG
      Red card
      OROrellano
3. 1. Second half
   2. 67'
      ARG
      GOOOAL!VRVíctor Rogelio Ramos