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It was the first time Chelsea lined up under new boss Antonio Conte.
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The Italian wasted no time in being a vocal presence on the sidelines.
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New signing N'Golo Kante (l) saw an early booking for this challenge on Andy Carroll.
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Newly appointed England boss Sam Allardyce (l) was an interested observer.
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As was fellow new international gaffer Roberto Martinez who has taken charge of Belgium.
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West Ham suffered a hammer blow when summer signing Andre Ayew hobbled off injured.
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The first-half ended 0-0 with Conte providing the greatest entertainment.
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Eden Hazard brought the second-half to life from the spot on 47 minutes to make it 1-0.
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It was Chelsea's first goal under Conte.
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Cesc Fabregas (l) and Dimitri Payet were somewhat surprise substitutes.
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Already on a booking, Diego Costa was lucky to avoid a second yellow when he fouled West Ham keeper Adrian (r).
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James Collins levelled for West Ham with a sublime strike.
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Costa won the game for Chelsea with a 90th minute strike.
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It sparked wild celebrations from the players...
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And of course, their manager and fans too.