River started brightly after the break and Ignacio Fernandez curled a long-range effort just wide after clever interplay between Lucas Pratto and Enzo Perez.

River continued to take the initiative and it was no surprise when the equalizer came in the 68th minute.

Another slick move involving Perez and Fernandez ended with Pratto and the striker made no mistake by rifling a first-time shot past Esteban Andrada.

The long trip from Buenos Aires seemed to take its toll on both teams as they wearily saw out the 90 minutes and forced the game into extra time.

Boca were dealt a hammer blow when Barrios was dismissed just two minutes into the first additional period. River immediately gained the ascendency and Quintero sent their fans into wild celebrations by arrowing a left-footed shot in off the crossbar after being picked out by Mayada.

Quintero then set up Martinez, who rolled the ball into a net that was left unguarded by Andrada's decision to go forward for a corner.

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