Barnsley 1 Peterborough 0: Cotterill winner for 10-man Tykes
The Welsh international winger hit a low drive past goalkeeper Paul Jones on 24 minutes.
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Hide AdThe dismissal of Tykes midfielder Nathan Doyle, just eight minutes later, for a rash challenge on Lee Tomlin ensured the game stayed on a knife edge.
But the Tykes soaked up considerable pressure and Peterborough substitute Emile Sinclair spurned two half chances to equalise late on.
Barnsley: Button, Wiseman, Foster, McNulty, Golbourne, Cotterill, Dawson, Doyle, Done, Gray, Davies. Subs: Lidakevicius, Smith, Higginbotham, Nouble, Collins.
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Hide AdPeterborough: Jones, Rowe, Zakuani, Brisley, Alcock, Boyd, Tomlin, McCann, Frecklington, Barnett, Taylor. Subs: Lewis, Little, Ball, Sinclair, Kearns.
Referee: Andy Haines (Tyne & Wear)
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