Saracens (14) 17 Tries: Leonelli, Cato Cons: Ross 2 Pens: Ross
Scarlets (16) 26 Tries: Lyons, Meeuws Cons: S Jones 2 Pens: S Jones 4
Saracens second row Chris Chesney clatters into the Scarlets defence
Saracens continued England's losing run in the opening round of the EDF Energy Cup as they went down to the Scarlets.
Scarlets took the lead through David Lyons but Sarries hit back as Francisco Leonelli and Noah Cato went over.
Stephen Jones kicked Scarlets into a 16-14 half-time lead before Gordon Ross answered but Kees Meeuws' try and a Jones penalty saw the Welsh side home.
Owen Farrell, 17, became the youngest English top-flight player since union went pro as a 67th-minute replacement.
The Saracens centre, son of former England rugby union international and Great Britain rugby league captain Andy, is just 17 years and 11 days old and beat Danny Cipriani's record by 36 days.
England fly-half Cipriani was 17 years and 47 days old when he first played for Wasps at Bristol in the Powergen Cup in December 2004.
Faced with Sarries' third match in the space of nine days, rugby director Eddie Jones made 14 changes from the side which won at Bristol in the Guinness Premiership on Wednesday.
The Scarlets fielded their strongest side after conceding a total of 66 points in defeats by Edinburgh and Glasgow in their last two Magners League matches, but they were far from convincing.
The Welsh side opened the scoring when they spurned an easy penalty and instead opted for a scrum, driving the Sarries pack back over their own line before ex-Australia international Lyons dropped on the ball for a converted score.
This page is best viewed in an up-to-date web browser with style sheets (CSS) enabled. While you will be able to view the content of this page in your current browser, you will not be able to get the full visual experience. Please consider upgrading your browser software or enabling style sheets (CSS) if you are able to do so.