Swansea City manager Michael Laudrup has admitted that the two first-half goals scored by Manchester United within two minutes changed the game in their favour.
"The first half an hour, everything was as planned and we moved the ball around, and they had only one shot on target," Laudrup told Sky Sports News.
"Suddenly, you saw the difference with two goals. The first one was a great finish, a very difficult one for Van Persie, and the other one there were a couple of mistakes.
"But two goals in two minutes, it's too difficult to come back from that. Then you saw the class of Van Persie for the third goal, it was an outstanding goal and at 3-0 it's finished."
Swansea got a goal back through Wilfried Bony, but Welbeck wrapped up the 4-1 win.