After trailing 1-0 in the first leg, Monterrey upset the odds to progress as 2-1 winners on aggregate.
Monterrey not only trailed 1-0, but were also an away goal down and the lower seed.
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It meant they needed to score at least twice to progress to the semi-finals, something they did in stunning fashion with a goal in each half from Dorlan Pabon and Candido Ramirez.