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Jesurun Rak-Sakyi marked his 22nd birthday in style, scoring a goal in each half, as the Blades brushed aside their struggling visitors.

The youngster was denied in the opening stages, but still ensured United got off to a strong start, firing in an emphatic finish after just 12 minutes.

He then got his second just seven minutes after the restart, sliding it through Thomas Kaminski's legs.

The Blades should have had a third late on when Vinicius Souza struck the post, but they had already done enough to take advantage of Sunderland dropping points against Leeds United to join it on 19 points at the summit.

Luton, meanwhile, is winless in three as it sits just above the relegation zone in 21st place.