A goal in each half from Kevin McKinley and Michael Gardyne gave Ross County a comfortable victory at Airdrie.
The duo combined to devastating effect for the opening goal after 23 minutes when McKinley diverted Gardyne's corner into the net from close range.
Gardyne got on the scoresheet after the break by latching on to Derek Adams' long ball, rounding the goalkeeper and slotting the ball into the empty net.
Airdrie's efforts to chase the game were snuffed out by County's defence.
Airdrie Utd: Robertson, McKenna (Taylor 59), Lovering, Smyth, Christie, Holmes, McDougall, McKeown (Watson 74), Prunty, Twigg (McPhee 53), McLaren. Subs Not Used: Tierney, Hollis.
Booked: Prunty, Taylor.
Ross County: Samson, Niven, Keddie, McCulloch, Dowie, Tiernan, Gardyn (Winters 83), Adams, Higgins (Gunn 68), Cowie, McKinlay. Subs Not Used: Malin, Hooks, Moore.
Booked: Niven, McKinlay, Adams. Goals: McKinlay 23, Gardyn 50.
Ref: J Underhill