The Blades picked up three vital points on the road - edging out Brentford Brentford at Griffin Park. An own goal set the ball rolling before Ollie Norwood and Leon Clarke, both with clinical strikes, netted.
Boss Wilder made two changes for the visit to the capital. Lundstram and Washington started, with Duffy and Sharp dropping to the bench. Norwood took the captain's armband.
Brentford grabbed the lead with their first attack, with just six minutes gone. A Sawyers pass put MAUPAY free down the left channel and his shot took a defection off Egan to deceive Henderson.
Within a minute United went close to levelling when Lundstram's effort came back off the crossbar but it wasn't long before the visitors equalised. Norwood delivered a corner from the left and it initially looked like O'Connell had won the header, but replays confirmed the ball had come off Bees defender KONSA before flying into the net.
Just five minutes later the Blades were ahead and there was no confusion over the scorer. Freeman laid inside and NORWOOD unleashed a curling, first-time effort from outside the box, which looped over goalkeeper Bentley into the top corner.
Soon after the lead was almost extended but McGoldrick's effort from close range struck Bentley's hand and was cleared.
Canos was a threat for the home side, cutting in from the left, but he was off target with a number of efforts and Egan also blocked from Maupay as half-time approached. Before the interval again United put the home side on the back foot. Bentley was well-placed to save a Norwood free-kick and Lundstram and McGoldrick both had efforts blocked in the same move.
United made an all-action start to the second period, Washington, Stevens and Lundstram were all involved in a move before McGoldrick saw a curling effort deflected wide.
Sawyers and Barbet both missed the target with opportunities and United threw on Clarke for McGoldrick as the pressure began to build. Maupay went down under an Egan challenge but the penalty appeals were waved away, although Brentford levelled soon after - again it was credited as an own goal as FLECK inadvertently deflected a Sawyers' cross past Henderson.
United had an immediate chance to regain the lead but Clarke's deft header from Fleck's cross was wide - although the substitute was soon to make an amends. On 72 minutes, the hard-working Washington, who was to get an ovation when he was substituted soon after, delivered a pinpoint low cross for CLARKE to sweep home first time, in front of the Blades fans.
Expectedly, Brentford were the more offensive force in the final 20 minutes as they searched for an equaliser. They had plenty of late possession but chances were limited.
Judge's volley on the turn was just wide and Egan cleared a dangerous Dalsgaard cross. As the referee's watch ticked around to 90 minutes, a foul on Dasilva gave Brentford an opportunity and Judge's free-kick from 25 yards beat the defensive wall but Henderson saved.
In added time, four minutes, there was just one chance of note for the home side but Henderson was ideally-placed to keep out Dalsgaard's deft flick ahead of referee Martin's final whistle to signal an important Blades win.
Brentford: Bentley, MacLeod (Odubajo 77), Mepham, Canos (Marcondes 53), Maupay, McEachran (Dasilva 77), Judge, Sawyers, Dalsgaard, Konsa, Barbet.
Unused: Daniels, Henry, Clarke, Oksanen.
Blades: Henderson, Stevens, Fleck, O'Connell, Basham, Lundstram (Coutts 67), Egan, Norwood, McGoldrick (Clarke 60), Freeman, Washington (Sharp 77).
Unused: Stearman, Duffy, Johnson, Moore.