Billy Mehmet's double helped St Mirren ease into the third round of the CIS Insurance Cup against Stenhousemuir.
Mehmet drilled the ball home from 16 yards and strike partner John Sutton slotted in the second soon after.
Sutton set up Mehmet to fire home from the edge of the box as the SPL side made sure of victory by half time.
Third Division Stenny then had Shaun Dillon sent off but pulled one back when a Joe McAlpine shot was deflected off team-mate Tom Sinclair.
The sparse 1,707 crowd waited only six minutes to see the home side take the lead.
Sutton failed to control a long ball from Ian Maxwell, but the unmarked Mehmet guided it past goalkeeper Willie McCulloch and into the corner of the net from 16 yards.
The Paisley side grabbed the second in the 14th minute when Garry Brady drilled the ball to Sutton 16 yards from goal and the striker turned and calmly slotted high past the despairing McCulloch.
A Brady cross from the right was volleyed against the crossbar by Mehmet from 12 yards.
But mehmet made no mistake when Sutton headed on another Maxwell long ball, the former Dunfermline striker shrugging off his marker before driving the ball in from the edge of the box.
Stenny striker Gareth Hutchison managed to miss the target from two yards out after being set up by Paul Murphy just before the break.
St Mirren appeared content to play out the game in the second half.
And the visitors were reduced to 10 men when Dillon, booked earlier for persistent fouling, received a second yellow after an overly-robust challenge on Hugh Murray.
But the Warriors pulled a goal back in the 76th minute when McAlpine's shot from 25 yards took a wicked deflection off substitute Sinclair.
St Mirren: Chris Smith, van Zanten, Millen, Potter (Murray 55), Broadfoot, Brady, Maxwell, Corcoran (Burke 73), Lappin, Sutton (Kean 73), Mehmet.
Subs Not Used: Bullock, Reid.
Goals: Mehmet 6, Sutton 14, Mehmet 30.
Stenhousemuir: McCulloch, Murie, Cowan (Sinclair 60), McAlpine, Dillon, McLeish, Murphy, McBride, McLaughlin (Diack 45), Connelly (Templeton 76), Hutchison.
Subs Not Used: Carlin, Menzies.
Sent Off: Dillon (73). Booked: Connelly, Dillon, Murie.
Goal: Sinclair 78.
Ref: C Richmond