Erling Haaland scored his 18th and 19th Premier League strikes of the campaign.
Match Summary
Manchester City go to the summit in the top flight following their victory.
The prolific forward takes his tally to 19 strikes in the league this season.
The Dutch midfielder scores another for City before half-time.
Erling Haaland scored twice to fire the reigning champions defeat struggling West Ham United for a fifth consecutive top-flight triumph.
The win propelled them top of the table, one point clear of their title rivals, who have a chance to retake top spot later on Saturday.
The visiting team, managed by Nuno, were desperate for a strong opening but found themselves behind within the opening five when Haaland converted at the second attempt.
West Ham's defense was breached with ease and Haaland somehow missed a close-range header soon after scoring.
The Dutchman did get on the scoresheet seven minutes before half-time, taking Haaland's pass before driving forward and firing a shot into the roof of the net.
In the second half, West Ham tried to claw something back but Jarrod Bowen hit the side netting and dragged another shot wide.
Haaland's second goal sealed a joyless festive period for the visitors, who are stuck inside the relegation zone.
It marked City's seventh straight win in every competition and the team are starting to put together the sort of streak that typically ends with trophies.
The Norwegian's opener and 69th-minute strike extended an astonishing season where he has scored 19 in the Premier League.
After Reijnders slammed in the second goal, the outcome was never in doubt as City extended their remarkable unbeaten run against sides in the drop zone.
The goalkeeper denied two City players late on, yet City's commanding win means they remain unbeaten against West Ham in two decades of league meetings.
For the West Ham fans, any hope of a shock triumph was extinguished within five minutes of the start.
The team have failed to see a new managerial bounce, with only two victories and now without a victory in their past six league fixtures.
Consequently, they sit in 18th place, three points adrift, with the deficit could grow as other teams have games in hand.
Aside from a couple of opportunities for their winger and a well-struck free-kick, they offered little threat for the opposition goalkeeper.
Historically, West Ham have avoided the drop when outside the bottom place at Christmas, providing a glimmer of hope for the current campaign.
Pep Guardiola's men: They have a break before playing again with a trip to Nottingham Forest.
Nuno's team: They host Fulham at their home ground on the same day.
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