[VIDEO] Santos suffer 1-0 defeat to Vélez Sarsfied in Buenos Aires
Mauro Obolo was the player that handed the Argentinian side the advantage in the tie, scoring a header 10 minutes before half-time.
Santos now face the task of overturning the deficit at the Vila Belmiro next Thursday if they are going to have a chance of retaining the South American crown.
VÉLEZ SARSFIELD: Marcelo Barovero; Gino Peruzzi, Fabián Cubero, Sebastián Domínguez, Emiliano Papa; Francisco Cerro (Héctor Canteros), Augusto Fernández, Alejandro Cabral (Iván Bella), Víctor Zapata; Juan Martínez (David Ramírez), Mauro Óbolo
SANTOS: Rafael; Henrique, Edu Dracena, Durval, Juan; Adriano, Arouca, Elano (Felipe Anderson), Paulo Henrique Ganso; Neymar, Alan Kardec (Borges)