The touchdown helped Warriors to a 14-5 half-time lead before a late comeback gave the visitors a narrow victory.
It was the Samoan's fifth Aviva Premiership try of the season and he is now the third top try scorer in the top-flight.
Lemi is up against Ken Pisi, Nick Abendanon, Chris Bell and David Strettle, who also impressed with their efforts at the weekend.
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