St Johnstone go into the final round of Premier Sports Cup group fixtures needing a win to stay alive — and the team standing directly in their path is a side from the tier below.

Simo Valakari's men sit third in Group F with six points from three matches, one behind East Fife and two adrift of leaders Inverness Caledonian Thistle, after a midweek defeat to Inverness knocked them off the pace (BBC Sport). The group stage is the opening act of Scotland's League Cup — the Premier Sports Cup — where 37 SPFL clubs not involved in European competition are split into eight groups of five, playing four matches each to fight for a place in the last 16 (SPFL).

The arithmetic is straightforward. Beat East Fife, and St Johnstone stay in the hunt for a knockout berth. Lose, and East Fife — who play in Scottish League 1, the third tier of the Scottish football pyramid — seal their own passage through (BBC Sport).

It gets tighter. Inverness, top of the group on eight points, need only a win of their own against bottom side Greenock Morton to guarantee their progress. Morton have zero points and a goal difference of minus six from three matches, making them the group's stragglers (SPFL). Linlithgow Rose, the fifth team in the group, have already completed their four matches with three points and a minus-five goal difference, leaving them rooted at the foot of the table.

The group standings tell the story of how fine the margins are. St Johnstone and East Fife both carry a goal difference of plus four from three matches — identical in every column except the single point separating them (SPFL). Inverness sit a point better off again, with a goal difference of plus three, meaning goal difference could yet decide who advances if results split the group on points.

This weekend's final round was always going to carry this tension. Entering the closing fixtures, ten qualifying places for the last 16 remained unclaimed across the competition (BBC Sport). The knockout phase — a straight single-elimination bracket beginning at the last-16 stage — is the prize every group winner and best runner-up chases (BBC Sport).

Elsewhere in the competition, several groups are still live. In Group H, Raith Rovers have finished their campaign on eight points with a plus-three goal difference, while Kilmarnock sit level on points with a game still to play and a slightly inferior goal difference of plus two (SPFL). Partick Thistle in Group E have completed their four matches with nine points and a commanding plus-ten goal difference, while Aberdeen lead Group A with a perfect nine points from three outings (SPFL).

For St Johnstone, the situation strips away any comfort. A midweek loss has turned their final group match into a bare-knuckle affair against lower-league opposition who have everything to gain. Valakari needs a response, and quickly. One result will decide whether their cup run extends into the knockout rounds or ends on a July evening in Fife.