Holders RBAI will face Sullivan in the quarter-finals of the Danske Bank Schools' Cup.
Daniel Soper's side beat Ballyclare HS 17-0 to progress safely through to the last eight.
In the other quarter-final ties, Campbell College will host Ballymena Academy, Wallace HS welcome Royal School Armagh while Bangor Grammar School go to Methody.
RS Armagh were the big winners of round four, earning a 45-0 success at Cambridge House.
The quarter-final ties are scheduled to be played on Saturday, February 17.
Danske Bank Schools' Cup quarter-final draw
Campbell College v Ballymena Academy
RBAI v Sullivan Upper
Wallace High School v Royal School Armagh
Methodist College v Bangor Grammar School
Danske Bank Schools' Cup round four results
Enniskillen Royal 10-28 Ballymena Academy
Bangor GS 12-3 Rainey Endowed
RS Dungannon 5-38 Wallace HS
Campbell College 41-0 Dalriada
Cambridge House 0-45 RS Armagh
Sullivan Upper 20-13 Down HS
RBAI 17-0 Ballyclare HS
Coleraine GS 3-38 Methodist College
Belfast Telegraph Digital