Manchester United boss Jose Mourinho was frustrated seeing Arsenal defeat Hull City yesterday.
Alexis Sanchez scored both goals against Hull City but his opener caused controversy after the ball struck his arm in the build-up.
"You know, other teams are good teams, other teams are lucky teams," said Mourinho after victory over Watford.
"Hull City were lucky against us… [then] were unlucky this afternoon [against Arsenal].
"We have an amazing record of being unbeaten but we should have more victories, and with more victories we would be in a better position.
"But this is what it is, and we have to keep fighting for points, and we have to keep trying to reach a better position."