Copa Libertadores – Quarter-finals (First Leg)

16 May 2012
Libertad – Universidad de Chile
Referee: Dario Ubriaco (URU, photo)
Assistant Referee 1: Mauricio Espinosa (URU)
Assistant Referee 2: Carlos Pastorino (URU)
Fourth Official: Liber Prudente (URU)

Vasco da Gama – Corinthians
Referee: Sandro Ricci (BRA)
Assistant Referee 1: Alessandro Rocha (BRA)
Assistant Referee 2: Roberto Braatz (BRA)
Fourth Official: Ricardo Marques (BRA)

17 May 2012
Boca Juniors – Fluminense
Referee: Jose Buitrago (COL)
Assistant Referee 1: Abraham Gonzalez (COL)
Assistant Referee 2: Wilmar Navarro (COL)
Fourth Official: Imer Machado (COL)

Velez Sarsfield – Santos
Referee: Carlos Amarilla (PAR)
Assistant Referee 1: Rodney Aquino (PAR)
Assistant Referee 2: Dario Gaona (PAR)
Fourth Official: Julio Quintana (PAR)