Paul Hayes scored as Scunthorpe made the FA Cup fourth round for the first time in six years with a 1-0 win over Barnsley at Glanford Park.
Hayes scored at Oakwell when the two sides met in the Championship earlier this season and he returned to haunt the south Yorkshire club once again.
The visitors were unbeaten in eight heading into the game, but they were not at the races on this occasion.
To be fair, Scunthorpe had also struggled to create goalscoring opportunities and it seemed a replay was on the cards until Hayes fired home with 22 minutes remaining.
Stephen Foster missed Barnsley's best chance when he headed straight at Josh Lillis after being picked out by Bobby Hassell and the Tykes were made to pay after 68 minutes when Jonathan Forte crossed for Hayes, who ghosted in to tuck the ball home from 12 yards out.