Max Watters scored in back-to-back games for Barnsley for the first time
Barnsley sealed a narrow 1-0 victory over their South Yorkshire rivals Sheffield United in the second round of the Carabao Cup.
Max Watters' second-half strike from close range was all that the League One side needed as a combination of resolute defending and poor finishing kept out their Championship opponents.
The Blades had a second-half goal ruled out for a foul on Barnsley goalkeeper Gabriel Slonina, who saved brilliantly from Tyrese Campbell's late strike.
Barnsley survived a late rally from the visitors to reach the third round of the competition for just the third time in 15 seasons.
The visitors controlled possession for long periods of the game, but failed to register a shot on target in a first half of very few clear chances.
Luca Connell floated a free-kick wide for the hosts in the second half, before Barry Cotter drove a high shot over the bar.
The breakthrough finally came when Cotter played in Adam Phillips, who put the ball on a plate for Watters to tap home.
Marc Roberts and Donovan Pines were among those to step up for their team and defend brilliantly in the latter stages as Chris Wilder's team pushed for a late equalising goal.
Sheffield United forced the ball home from a free-kick, but the referee disallowed the goal after spotting unfair contact on Slonina.
The Tykes keeper was determined to see his side progress and was ultimately rewarded after showing off his excellent reflexes to tip Campbell's close-range effort on to the post late on.
