A second-half Ademola Lookman strike proved decisive as a resurgent Fulham cut the gap to safety to just three points.
The game started quickly from both sides, with the noise from the dugouts adding to the tension of what seemed a must-win game.
Chris Wilder’s men were penned back into their own half for much of the opening 45 minutes, but defended resolutely, with a number of well-timed trips in the midfield preventing Fulham from building up momentum.
Fulham’s stand-in captain in the long-term absence of Tom Cairney, Joachim Andersen was a commanding presence at the back, not only in organising the defence but with his well-weighted long balls to the front players.
Harrison Reed had a shot from distance straight at Ramsdale, with the goalkeeper also in the right place to deny Lookman.
United went into the half-time break without a touch or attempt in the Fulham box but were doing a good job of defending their own, and got men behind the ball to break up the home side’s attacks.
At the start of the second half, Ruben Loftus-Cheek came close to giving the home side the lead when he weaved his way through the United defence before his goal-bound shot hit Ramsdale’s outstretched leg and was cleared off the line by George Baldock.
Lookman put the hosts ahead just after the hour mark with his fourth goal of the season, and his second against the Blades.
The 23-year-old worked his way into the area from the left-hand side before firing a low drive past Ramsdale and into the back of the net.
Lookman opens the scoring as Fulham take the lead but what about that pass from Andersen…😍
— Sky Sports Premier League (@SkySportsPL) February 20, 2021
Less than five minutes later, the visitors had their first shot on target, with Alphonse Areola just denying Enda Stevens with his legs in a one-on-one situation.
United had a penalty shout in the final minutes of the game, when Areola dived out to deny Jayden Bogle. The goalkeeper put his body on the line and just managed to get a touch on the ball before the collision.