"We were a complicated team and let them feel comfortable".
Romelu Lukaku was twice denied by smart saves from Ben Foster, while Jesse Lingard also came close after his introduction from the bench at half-time.
The result leaves second-placed United just one point above Liverpool, although Jose Mourinho's side do have a game in hand.
"Manchester City, we won it for you", chanted the West Brom fans at the end of a match greeted by jeers by United supporters. United weren't capitalizing on their chances, and whenever the ball was lost, justice was done by him quite well.
They certainly were stunned at Old Trafford when Jay Rodriguez led home although United had to draw keep the title race alive. That will be the, but it is easier said than done.
Afterwards, Mourinho indicated that his players did not execute the game plan as he had hoped. There was disappointment, joy, excitement, aggression, everything.
He'd have already been as amazed as everybody that the title, apparently a foregone decision for months, was rubber stamped this sort of strange conditions.
Former England international Gary Lineker, who now work as a television presenter, tweeted: "Congratulations to @ManCity on winning the Premier League title".
Guardiola's response was to spend a club record 57 million pounds ($80.3 million) on Aymeric Laporte from Athletic Bilbao in January, taking his spending to an eye-watering 448 million pounds on 16 players since arriving. The last time they were relegated in 2009, they finished second in the Championship the following season to come straight back up. "The players gave an amazing performance". The City man has received criticism all season, despite the improvement in his play and also has to constantly endure the boos whenever he returns to Anfield.
Marcus Rashford and Anthony Martial began the game on the bench, but the players picked ahead of them only made a case for why the pair should start more often.
Paul Pogba's two goals against City felt like a defining moment for the France midfielder during a season which has had more downs than ups.
The champions have scored 93 times and conceded on 25 occasions.
Mourinho was asked whether he took off Pogba because he had a yellow card and was at risk of getting sent off.
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