Scarlets picked up a crucial 26-14 victory over Glasgow at Scotstoun on Friday in a result that moves them above the Warriors in the PRO12.
Pat MacArthur grabbed the first try for Glasgow, but Tom Williams and James Davies put the Scarlets in 20-11 ahead.
The second-half was less dramatic but it was Scarlets who picked up the win.
After a lengthy spell away from PRO12 action, Scarlets were hoping to build on their victory last time out against Ulster. That was never going to be easy against an in-form Glasgow side who had lost just one in 10 before this one.
But the first half belonged to the visitors as they went in ahead. Rory Clegg kicked the hosts three points ahead only a couple of minutes in to the evening, but Dan Jones levelled from halfway only a few minutes after.
The visitors were arguably the better side in the opening exchanges, but a yellow card turned the tide. Jones was the man who went from hero to villain after being adjudged to have come in to a challenge late, and his yellow allowed the Warriors to grab the opening try. A line-out caused panic by the try-line and after the TMO had his say, the try was awarded as MacArthur managed to reach over the line.
The conversion was missed though and Scarlets were soon back on top as they levelled the try scoring. Still a man down, an attacking line-out saw the Welsh side feed the ball across the field and Hadleigh Parkes pass allowed Williams to go through. Williams kicked them ahead in the absence of Jones and the rest of the half began to Scarlets.
Aside from Glasgow momentarily taking the lead back with a penalty, Scarlets were on top for the last 10 minutes as they went into the break in front.
Jones put Scarlets back in the ascendancy and Davies went over a minute before half-time for a nine-point half time lead. The visitors went right through the phases and the flanker crossed in the corner, with the extras from Jones taking the sides into the break.
Glasgow reduced the gap thanks to another Clegg penalty from the middle of the pitch, but Jones restored that nine point gap from his next opportunity.
It was the Warriors who were looking stronger as the half wore on, and they spent decent spells metres from Scarlets line.
But with five minutes to go, a penalty from Aled Thomas made the gap 12 points and the clock proved to be against Glasgow whose strong form came to a crashing halt at Scotstoun.
Pens: Clegg 3
Tries: Williams, J Davies
Cons: Williams D Jones
Pens: D Jones 3, Thomas
Yellow Card: D Jones
Glasgow: 15 Peter Murchie, 14 Lee Jones, 13 Nick Grigg, 12 Sam Johnson, 11 Rory Hughes, 10 Rory Clegg, 9 Henry Pyrgos, 8 Adam Ashe, 7 Chris Fusaro, 6 Rob Harley, 5 Scott Cummings, 4 Brian Alainu’uese, 3 D’arcy Rae, 2 Pat MacArthur, 1 Alex Allan
Replacements: 16 James Malcolm, 17 Jamie Bhatti, 18 Sila Puafisi, 19 Richie Vernon, 20 Lewis Wynne, 21 Grayson Hart, 22 Hagen Schulte, 23 Sean Lamont
Scarlets: 15 Johnny McNicholl, 14 Tom Williams, 13 Gareth Owen, 12 Hadleigh Parkes (c), 11 DTH van der Merwe, 10 Dan Jones, 9 Jonathan Evans, 8 Will Boyde, 7 James Davies, 6 Aaron Shingler, 5 Lewis Rawlins, 4 Tom Price, 3 Werner Kruger, 2 Ryan Elias, 1 Wyn Jones
Replacements: 16 Emyr Phillips, 17 Luke Garrett, 18 Nicky Thomas, 19 Tadhg Beirne, 20 Joshua Macleod, 21 Aled Davies, 22 Aled Thomas, 23 Steff Hughes
Referee: George Clancy (Ireland)
Assistant Referees: Gary Conway (Ireland), Kevin White (Scotland)
TMO: Brian MacNeice (Ireland)