Just two seasons ago No.8 Kieran Murphy was playing for Mumbles but he made an instant impact on his Scarlets debut with a pair of tries after George Ford booted the visitors into the lead.
That gave Nigel Davies’ men a 12-3 lead and they went into the interval with a 14-point advantage after fellow debutant Matt Gilbert crashed into the corner.
They carried their fine form in the second half with former Wales Under20 international Liam Williams racing clearing for a superb try.
Adam Warren, who scored two tries against Edinburgh last week, ran an inside decoy off replacement fly-half Jordan Williams to open the floodgates for Williams to burst clear.
Williams converted the effort before he capped a fine performance with a last-minute length of the pitch try.
Following a sustained period of pressure the Scarlets kicked-through and beat the cover to hack on and then regain the ball on the bounce to squeeze in the corner.
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