Jose Mourinho suffered his first Premier League defeat in his second stint as Chelsea manager with a 1-0 win recorded by Everton at Goodison Park.
A first-half Steven Naismith header was enough for Everton to clinch their first victory of the season which also doubles as Roberto Martinez's first victory at Everton's helm.
Mourinho's side were guilty of some early misses with Samuel Eto'o who started ahead of Fernando Torres the main culprit.
Eto'o - who was making his debut as a Chelsea player - squandered several chances in front of goal as the Cameroonian fired blank.
Chelsea enjoyed appreciable levels of possession in the opening stages but Everton looked a threat on the break and had a good chance through Nikica Jelavic, but the Croatian striker could only send a weak header straight at Petr Cech.
Gareth Barry also made his debut on the day. The on-loan combative midfielder was to thank for a sensational block which denied Eto'o the chance to slip the ball into the net after he was fed by Andre Schurrle who was quick to pounce on a blunder by goalkeeper Tim Howard.
Mourinho was visibly infuriated by his side's lack of fire power in front of goal as Schurrle also blasted wide from close range.
Chelsea were eventually punished for not taking their chances as the host pounced on the stroke of half-time as Naismith headed Everton into the lead from close range, wrapping up a great work from Ross Barkley, Leon Osman and Jelavic.
The Blues continued to press for the equaliser in the early stages of the second half stepping up the pace of the game. They had what was thought to be a penalty turned down just before the hour mark, when substitute Oscar was sandwiched between Sylvain Distin and Osman.
Chelsea became increasingly frantic as the final whistle approached and even had to play three defenders at the back in a bid to push more men forward.
In the end, Mourinho's men had to succumb to a disappointing first defeat of the season. A result which means last season's Premier League top four teams have all lost a game apiece this season.
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