Arbroath beat Kilmarnock 1-0 in front of 2,803 fans at Gayfield on Friday evening to move four points clear at the top of the cinch Championship.
On-loan Livingston striker Jack Hamilton scored the only goal early in the second half when his 25-yard drive wasn’t dealt with by Killie keeper Zach Hemming.
The Red Lichties had James Craigen sent off with five minutes left but Dick Campbell's side held on for a significant win against the title favourites.