United was lucky to have won yesterday. Brighton was a far better team before the red card and that De Gea's save at the end of the 1st half was truly world class.
At the end when Brighton was left with 10 men individual quality came through - but United will have to play a lot better than this if they want to keep the top 4 position they climbed into with yesterday's win.
This is the plain truth that we are also supposed to know: Manchester United must improve their performance in order to finish in the top four this season. This is because there are almost three teams in contention for the top four: West Ham United, Arsenal, Tottenham Hotspur, and Manchester United. It's a bit complicated, so for Manchester United to secure Champions League tickets, they must improve their performance.