St Johnstone and Ayr United failed to conjure up a goal in a poor Scottish Cup tie, although the visitors perhaps deserved more from the game.
A fierce Steven Milne drive saved by Ayr keeper Mark McGeown was the highlight of a poor first-half.
Ayr restarted brightly and David Dunn hit a superb 35-yard strike only to be denied by Saints keeper Kevin Cuthbert.
The visitors continued to press and came close when Jerome Vareille spooned over from short range.
St Johnstone: Cuthbert, Lawrie, Dyer (McLaren 80), Mensing, McManus, Anderson, Sheerin, McInnes, Milne (Jackson 69), Scotland (MacDonald 46), Stanic.
Subs Not Used: Doris, Halliwell.
Booked: Dyer, McManus, Anderson.
Ayr Utd: McGeown, Caddis, Lowing, Forrest, Campbell, Robertson, Strain (Hyslop 90), Casey, Vareille (Friels 85), Wardlaw, Dunn.
Subs Not Used: Brian Reid, Pettigrew, Johnson.
Ref: M Tumilty