Manchester City travelled to Leicester knowing that three points would keep them comfortably in the title race.
The Foxes, meanwhile, found themselves just a point above the relegation zone at kick-off after five winless games.
An easy three points for the visitors, then, even without the suspended Sergio Agüero? Not quite.
Instead, the hosts were 2-0 up within five minutes, and three to the good before the clock read 20.
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Predictably, attention turned towards Pep Guardiola and his creative approach to the game, which included playing Pablo Zabaleta in a midfield role.
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Whatever the former Bayern Munich boss was trying to do, it wasn't working.
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Of course, Claudio Bravo's input played a part, as usual.
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Leicester managed to add a fourth goal in the second half, Jamie Vardy capitalising on a John Stones mistake to complete his hat-trick.
And at least that goal allowed people to take a break from the Man City pile-on. For about two seconds.
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There was still time for Aleksandar Kolarov to pull one back with a free-kick and set up Nolito for a second Man City goal, but the damage was well and truly done.
And it didn't do much to improve the Serbian defender midfielder defender's evening.
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It finished 4-1, lifting Leicester to 14th and leaving Guardiola's team four points adrift from league leaders Chelsea.
That margin will become seven if Antonio Conte's team beat West Bromwich Albion tomorrow - a stark contrast from earlier in the campaign.
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