Alloa, Livingston and Stranraer have booked their places in Tuesday afternoon's draw for the semi-finals of the Petrofac Training Cup.
Ryan McCord grabbed a last-minute winner as Alloa continued their recent good form with a 1-0 victory over Morton at Cappielow.
Anthony Marenghi, a summer signing from Ayr United, scored just before half-time as Stranraer defeated Falkirk 1-0 at Stair Park.
It was also 1-0 at Balmoor, where an extra time goal from Myles Hippolyte saw Livingston get the better of Peterhead. The Blue Toon had Andy Rodgers sent off in the last minute.
The East Fife v Rangers quarter-final was postponed today due to international call-ups and has been rearranged for Tuesday October 21.