cross cannoned off Carrick and into the path of Sinclair who, with the goal gaping and De Gea struggling to get back in position, completely missed the ball from eight yards out.
The Reds, in relative control thereafter, set about trying to build on the 1-0 advantage. After Giggs had flashed a free-kick just wide nine minutes from the break, Hernandez found himself clear down the right but he over-hit his cross towards the onrushing Rooney and the chance was gone.
It was the Swans who had the first sight of goal after the restart. Joe Allen, brought on to replace Routledge, rolled the ball out to Sinclair who sent a powerful left-foot drive goalwards, but it was well parried by De Gea. Gary Monk then miscued a free header from the resulting corner.
The Swans continued to battle but De Gea and co. held firm. At the other end, Hernandez was always a threat on the break, while Rooney was involved in virtually all of United’s good play. Indeed, the England striker tried his luck from long range on 70 minutes, but Vorm claimed well.
With only one goal in it, the Swans continued to probe. Sinclair escaped the attentions of Rooney down the left and picked out Graham in the box. His shot was well blocked by Carrick, while Ashley Williams saw his follow-up effort cleared by Ferdinand.
With time almost up, the Reds went close to doubling the lead on three occasions in quick succession. First, Rooney chipped the ball onto the roof of the net, and then Jones, on one of his now renowned bursts forward, saw his low drive from inside the area deflected against the far post by Vorm. Finally, Nani sent a curling effort just wide.