United lead at the break thanks to Bruno Fernandes first goal for the club.
The Portuguese converted the penalty he had won after being hauled down by Ben Foster, but aside from that it's been a testing first period at Old Trafford for the hosts, who have struggled in both defence and attack.
That penalty from Bruno Fernandes was the first Premier League goal Manchester United have scored at Old Trafford in nearly four hours of football.
Before that, the last time they scored in the league at home was through Mason Greenwood, who got the final goal in their 4-0 thrashing of Norwich on January 11.
However, Watford are putting a lot of pressure on Man United side.
We expect them to do something interesting in the second half.