Manchester United boss David Moyes felt they could've won last night after their draw at Arsenal.
Moyes felt on another night, United could have left north London with all three points.
He said: "I thought we did a lot of good things in the game. We had good shape and were nice and compact. We had some good moments in the game.
"We had a great chance in the opening minute. I thought whoever would have got the first goal it would have been important and we had a great opportunity to get that.
"It (Van Persie's chance) was a great move, A great ball from Wayne Rooney and a great header. The goalie made a great save and near enough pulls it out of the back of the net.
"On another night Robin might have had a hat trick. He had three good chances."