John Terry scored his second goal in a week, before Diego Costa netted a sensational second as Chelsea maintained their lead at the top of the Premier League on Boxing Day.
There had been some question marks raised over Costa's form throughout previous weeks, but we witnessed glimpses of his outstanding quality as the Blues overcame their London rivals.
While Terry stole the plaudits with his man-of-the-match display, it was the former Atletico Madrid striker who produced the goods in attack, thanks to his incessant work-rate and never-say-die mentality.
He proved a constant thorn in the side of the Hammers defence, rounding off his performance with a well taken goal, as well as a first-half assist.
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He struggled in front of goal throughout the first half, fluffing a number of fantastic opportunities. Nevertheless, he turned up after the break, concluding a wonderful solo move with a delightful finish past the outstretched Adrian.
This was by no means his most clinical display - he hit the target from just one of his six attempts - yet he looked back to his physical best, causing tremendous difficulties all afternoon.
Just as we had witnessed throughout the opening weeks of the season, Costa's hold-up play as a lone-striker is phenomenal. Here, he played a match-highest four key passes, while completing two dribbles and drawing two fouls.
He may have completed just 76.7% of his attempts to find a team-mate, but this is ultimately a consequence of the considerable defensive pressure he faced throughout his 83 minute cameo.
The Spaniard's presence proved a major factor in the Blues' dominance, as Jose Mourinho will have anticipated prior to kick-off.
The Portuguese head coach will be praying his star striker can regain his best form throughout the remainder of the festive period. If he can remain injury-free, it won't be long until he is firing on all cylinders.