A second half brace of strikes after Cillian Sheridan had scored his first Kilmarnock goal handed victory to the Ayrshire men against St Mirren.
Sheridan opened the scoring when he glanced home Danny Racchi's pin-point delivery after 26 minutes and James Fowler doubled the hosts' lead 12 minutes into the second half.
A wonderful individual effort from James Dayton on the hour mark added to St Mirren's misery, and despite Paul McGowan's deflected consolation the hosts held on to claim their second win of the season.
Marc McAusland became the first player to pick up a yellow card, after 14 minutes, when he handled the ball under pressure from Sheridan.
Sheridan then notched his first goal since arriving from CSKA Sofia earlier in the month.
St Mirren were too complacent in bringing the ball out of defence and Harkins was quick to dispossess McGowan before feeding Racchi who swung over an inch-perfect cross for Sheridan to nod home from six yards.
After falling behind against the run of play, St Mirren responded in a positive fashion.
Dummett forced James Fowler into a crucial goal-line clearance before Letheren did well to gather Teale's strike at the second attempt.
Both teams struggled to retain possession in a scrappy opening to the second half, with McGowan's tame effort after 52 minutes the only notable attempt on goal.
Kilmarnock responded at the other end and they were to double their lead after 57 minutes.
Racchi's shot was deflected off the back of Sheridan and into the path of Fowler who rocketed a shot beyond the helpless Samson.
Dayton then weaved his way past two defenders before blasting the ball high into the net from a tight angle.
McGowan gave the large Saints travelling support some late hope when his deflected effort left Letheren flat-footed and found the bottom corner.
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