McInally, who won the trophy three years in succession from 2003 to 2005 is on course to repeat the feat, having won the event in both 2009 and 2010.
The remaining quarter final matches, due for completion this weekend, are :-
Ewan McKinnon (Corrie) Vs. John Sloan (Doon Valley)
Scott Brown (Turnberry) Vs. Stephen McEwan (Caprington)
Adam Sweeney (Largs Routenburn) Vs. Gary Bryden (Girvan)