Porto and Benfica went into the game with both sides unbeaten, and the reigning champions two points behind the Lisbon giants.
But Kelvin’s late, late winner puts Porto top and within touching distance of another title.
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Since Guus Hiddink arrived at the helm, Chelsea have improved considerably after a tricky start to the campaign.
Newcastle United are staring down the barrel of relegation to the Championship for the second time in the past eight years.