Leicester Tigers slipped to a 15-3 defeat against the Scarlets in their European Champions Cup clash in south Wales.
It was a bitterly disappointing performance from Tigers, who were looking to back up their opening game win over Ulster.
But their hopes were hit by their own errors as the home side were gifted two tries and ran out worthy winners.
Tigers began the game brightly as they took the game to their Welsh hosts and both wingers Blaine Scully and Miles Benjamin tested the Scarlets defence out wide.
Benjamin's sortie into the home 22 ought to have led to Tigers taking the lead. The ball was fed across the face of the posts to Anthony Allen but with the line at his mercy the Tigers centre spilled the ball.
Leicester did go in front in the 14th minute when Owen Williams landed a penalty after Scarlets had been penalised at a scrum and at that stage the visitors had a good grip on the game.
However, that all changed in the 22nd minute when Benjamin fumbled the ball close to his own line and Harry Robinson scored the easiest of tries.
Rhys Priestland missed the conversion and then two more penalties but it was clear that Scarlets now had belief in their ability to rattle Leicester and they moved into an 8-3 lead when Steve Shingler, having taken on the kicking duties, landed a penalty after Tigers had been penalised for offside.
There was still a chance for both sides to miss penalties before half-time arrived but there was little doubt one side was considerably happier than the other.
Half-time: Scarlets 8 Tigers 3
Leicester needed to re-eastablish themselves at the start of the second half but they were faced by a home side lifted by their first-half performance.
As a result Tigers were rarely seen as an attacking force and whenever they did threaten the Scarlets line they turned over possession.
The only score of the half came when Youngs made a break down the right but as he attempted to off-load the ball was intercepted by his Scarlets counterpart, Aled Davies, who sprinted
40 yards to score. Shingler added the two points and Leicester had a mountain to climb.
They never looked like getting to the summit – or anywhere near it. There were a couple of late breaks from Benjamin but the home defence remained solid leaving the Tigers empty-handed.
