Best performances by a junior side v LOI opposition

[gspain]

Pegasus were knocked out by Dundalk in the First Round in 1976/77. They did however win the Intermediate Cup that season.

I've a vague memory somewhere of Pegasus maybe beating Home Farm but no way did they reach a Cup semi final.

[CollegeTillIDie]

Ashtown Villa beat Dundalk and Derry two rounds in a row one year. Back when both would've been top four teams

Pats (55 years) and Cork (22 years) are the only club not to have been knocked out by non league opposition.

UCD have never been knocked out of the FAI Cup by Non-League opposition since joining the League in 1979.