Glenn Murray scored for the third successive game as Brighton inflicted yet more home misery on struggling Swansea.
Murray's 29th-minute close-range effort gave Brighton 1-0 win and took the Seagulls into the top half of the table in their debut Premier League season.
It was another victory down to commitment, energy and organisation, with Brighton boss Chris Hughton winning the tactical battle and Lewis Dunk and Shane Duffy outstanding in central defence.
Brighton have lost once in six games and their victory was only briefly threatened when substitute Luciano Narsingh struck the crossbar in stoppage time.
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