Louis Van Gaal's first Premier League game in charge of Manchester United ended in defeat as Swansea City claimed their first ever league win at Old Trafford.
Ki Sung-yeung's shot gave Swansea the lead before new Manchester United captain Wayne Rooney equalised.
Gylfi Sigurdsson's late goal put the Welsh side back in front and condemned United to their first opening day home defeat since 1972.
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