Phil Brown's side, who had won just one of their last six matches, took the lead at Roots Hall through Tyrone Barnett's close-range finish midway through the first half but were pegged back when Dean Hammond headed through the legs of goalkeeper Daniel Bentley.
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League One: Southend United 3 Sheffield United 1
Southend United gave their League One play-off hopes a lift with a 3-1 victory at home to Sheffield United.
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David Worrall drilled the hosts back in front after the break and, after Che Adams had hit the post for the visitors, the win was sealed with a fine run and chipped finish from Jack Payne as Southend broke from a United corner.
Southend are now up to eighth, six points off the play-off places, while United are 13th.
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