We controlled the possession for long spells of the quarter-final clash at Hotspur Way, but a combination of passes not reaching their intended targets and the visitors maintaining a stubborn five-man rearguard kept us at bay.
Porto grabbed the lead against the run of play on the half-hour mark when Diogo Liete's powerful header from a corner went in off Oliver Skipp and it was 2-0 within 10 minutes as we gave possession away cheaply and Santiago Vera's shot squirmed under goalkeeper Brandon Austin.
It was attack versus defence in our favour for much of the second half with Samuel Shashoua and Phoenix Patterson looking to weave their way into good areas, but we still didn't create anything clear-cut and our misery was compounded in stoppage time when George Marsh picked up a second yellow card and subsequent red.