St Mirren B fell to a late defeat away to Kelty Hearts in the KDM Evolution Trophy on Saturday.
Having picked up four points from their opening four fixtures, a win would have put the young Saints in a strong position to reach the last 32 with only one match remaining in the league phase.
And the Buddies would get off to a bright start with Carrick Mcevoy stealing possession in the middle of the park and sliding the ball through to Luke Douglas. The forward drove forward, making his way into the box, before twisting and turning the Kelty defence and slotting beyond goalkeeper Corey Armour to give Saints the lead on 15 minutes.
The hosts struck back nine minutes later with loanee Ricco Diack levelling the scores. The striker turned home from close range to make it 1-1. Diack would score the winner for the hosts with 13 minutes remaining. His initial header came off the cross bar, but he was in the right place at the right time to home the rebound and ensure the points remained with the Fifers.
The young Buddies close out the league phase away to Stranraer on Tuesday 11th November. A win against the League Two side could still be enough for St Mirren B to secure their place in the round of 32.
Full-Time: Kelty Hearts 2-1 St Mirren B
St Mirren B: Mullen, Hutchison, Clark, Hunter, Penman (Lavery 46), Hodgkiss (Stoddart 72), Mcevoy (c), Thompson, Falconer (Farquhar 78), Calvin, Douglas
Subs Not Used: Innes, Barr, Kiely, Rehman, Morrow
Kelty Hearts: Armour, Scott, Clay, Brydon, Thomas, Leitch (Snoddy 87), Ferguson, McInally (Murray 46), McCarvel (Moore 64), Diack (Winiarski 87), Bexfield (Campbell 79)
Subs Not Used: Adamson, Brown, McHale