Substitute Tom Adeyemi scored with his first touch to hand promotion-chasing Brentford a win over Scunthorpe.
Visiting keeper Sam Slocombe, who was lucky not to see red when he handled outside the box, prevented the scoreline from being more emphatic.
He thwarted Marcello Trotta with two saves and was equal to a Bradley Wright-Phillips effort.
Tom Newey had the Iron's best chance but blazed over and Adeyemi punished them by side-footing in on 70 minutes.
Scunthorpe lie perilously close to the League One drop zone, two points clear of the bottom four.
But fourth-placed Brentford kept the pressure on their promotion rivals and are three points adrift of the top two.
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Scunthorpe manager Brian Laws told BBC Radio Humberside:
"The disappointing thing is they scored when we were getting on top of the game. We nullified them and we didn't allow them to have the freedom of the park.
"We still had a few chances to try and get back in the game. I'm delighted with the work ethic of the players and if we continue in that same vain, we'll win games.
"Not many teams come here and win or get results and I thought we were very close to getting one.
"In tense games there is always going to be probably one incident that's going to win you the game, and they got it unfortunately."