Exactly, if United fails to win today's match, i'm afraid City is the title winner already. Manchester Derby are not always easy encounters. Both teams have got to play to the fullest to win in matches like this especially one where we have Jose Mourinho vs Pep Guardiola.
On the otherhand, I salute the bravery of West Ham yesterday. They locked all entries after stealing that early goal. It is indeed a world class defending.