George Wallace & Neil Black (Saxone) beat John Sloan & Robert Long (Tam O Shanter) by 3 & 2 at home in round three to book their next tie at New Cumnock.
Also into the last eight are Andrew Macleod & John Cook (Rowallan Castle) who had a 2 & 1 away win against John Paul Flannigan & Eddie Saunders (Troon St Meddans) in round three.
The Rowallan Castle due will now have a home tie in the quarter finals against either Ayr Belleisle or Wallacetown.
All third round ties are due to be completed by next Sunday, 21st June.
The updated draw for the quarter finals is :-
NEW CUMNOCK Vs SAXONE
ROWALLAN CASTLE Vs AYR BELLEISLE or WALLACETOWN
AYR SEAFIELD or SKELMORLIE Vs CROSSHOUSE
BRUNSTON CASTLE or MUIRKIRK Vs DOON VALLEY