Dario Benedetto had given Boca the lead at the Bernabeu, but it always felt unlikely that the game would finish 1-0 and so it proved.
Having dominated the first 45, Boca inexplicably took their foot off the gas after the break and they were eventually punished as River finally put together a flowing move.
'Los Millonarios' strung together a series of passes in the middle of the park, culminating with Nacho Fernandez being slipped into the right-hand channel by Sebastian Palacios.
It was at that point that Pratto darted away from his marker to meet Fernandez's cutback and guide a first-time effort into the far corner to bring his side back into the tie, just as he had done in the first leg.
December 9, 2018