The tie started with United dominating th eball and playing with a lot of intent compared to their previous few fixtures, and within seven minutes, 19-year-old Shea Lacey, making his first-ever senior start, scored a belting goal.
Then, within a few minutes, Mason Mount doubled United's lead with a beautiful bounced effort over the goalkeeper, putting United in firm control of the tie, although their performance slowed after the two goals as Brighton grew into the game.
A late goal in the first half from Charalampos Kostoulas will give the Seagulls hope for the second half.
Below are United's player ratings so far in what has been a mixed first 45 minutes for the Reds.
Strong opening punches and a commanding presence in the box, although he could have done better for Brighton's first goal.
After a poor performance vs Man City, Dalot wasn't too notable in the first half, which is probably a good thing.
Had a dodgy moment in the first half but generally looked comfortable on the ball.
Got caught looking over his shoulder for Brighton's goal, but some big blocks and tackles before then.
Took a blow that knocked him for a bit, but generally didn't let too much down his side.
Very proactive in midfield, may need to improve his control a little, but doing well defensively.
Very commanding with the armband on his sleeve, keeping the game ticking well and also defending with great poise.
A first start for United, but a player who looks mature beyond his years. Stunning strike to give United an early lead
First minutes of the season and secured an early goal, dictated play well.
Looks bright, clearly very keen to score his first goal back at United.
Much better to watch United with a clear focal point up front
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