Boxing Day's 1-0 win at Norwich was Spain forward Mata's 50th appearance in the Barclays Premier League and came less than a season a half after he joined the Blues.
Carrow Road also witnessed his 13th goal in all competitions this term, already bettering his tally from the whole of the last campaign.
Rarely has a foreign player made such a seamless adjustment to English football as former Valencia star Mata, who has enjoyed the unwavering confidence of all three Chelsea managers he has played under.
Last season he featured in 34 of Chelsea's 38 league games, while this term he has played a part in 16 of 18.
But despite his 50 matches being the most of any outfield player at the club over the same period, Mata had no intention of allowing his team-mates to catch him up.
"I want to play more, I want to keep playing, keep training, keep enjoying this club and this Premier League," he told Chelsea TV.
Modestly describing his goals tally as "not bad", he added: "I'm very happy with how it's going - the season - for me and for the team and I just have to keep working."
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- Barclays Premier League