The game had been billed as a duel between the two Spanish international strikers Negredo and Swansea's Fernando Llorente but the Boro man won hands down, scoring on 18 minutes with a lovely first-time finish from Adam Clayton's low cross.
He claimed his second from the spot after Adam Forshaw was tripped in the box by Jordi Amat, sending Swansea to second-bottom of the table after conceding 18 goals in their last six away games.
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(Reporting by Ian Chadband, editing by Ed Osmond)
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