Scarlets' break their Musgrave duck
Andy Fenby's late try secured Scarlets' first-ever win at Musgrave Park and a first Pro12 win over Munster for five years.
And in a miserable match in Cork Ireland flank Niall Ronan was forced leave the field on a stretcher after suffering a head injury.
The openside went off after 36 minutes, following a long injury stoppage - having taken a blow to the head when Jake Ball hurtled into a ruck near the halfway line, an incident which may result in the young Scarlets lock facing disciplinary action.
In the other Sunday match Ceri Sweeney's boot proved the difference as he kicked nine second-half points to secure a 14-7 win at Zebre to halt Cardiff Blue's slide which had seen them lose their last four Pro12 matches.
The Italians are still searching for their first ever-win in the competition despite a brave performance after taking a 7-0 lead through Samuele Pace's try midway through the first half.
We look at all Sunday's action!
Munster 6-13 Scarlets
Andy Fenby's late try secured Scarlets' first-ever win at Musgrave Park and a first Pro12 win over Munster for five years.
With just 10 minutes remaining Scarlets held a narrow 6-3 lead, Aled Thomas kicking two penalties while Ian Keatley could only manage one in reply for the hosts.
But Munster fullback Felix Jones fumbled the ball over his own try line and wing Fenby was quick to pounce on it to give the visitors some much-needed breathing space.
This was Scarlets' seventh win in their last nine Pro12 games, but none would have been more celebrated than this one, their first victory over Munster in 16 attempts.
It was Munster who started the game well and looked likely to help themselves to an early score, some desperate defending keeping Jones at bay after six minutes.
Thomas then had the chance to kick Scarlets into the lead with a penalty on ten minutes, but his effort was taken by the wind and went wide of the posts.
Keatley then had the chance to get the first score of the game with a three-pointer of his own on 22 minutes, and the Munster fly-half duly took his chance.
However just before half an hour Thomas made amends for his earlier miss as he booted an easy penalty from in front of the posts to level the score.
The game was then delayed for a lengthy period as Munster's Niall Ronan had to be stretchered off after a knock on the head.
But despite the delay to an injured team-mate it was Munster who ended the first half in ascendancy.
Scarlets defended desperately right before the interval and CJ Stander, who replaced the injured Ronan, was adjudged to have been held up by the television match official.
Scarlets survived and had the chance to stretch their lead just three minutes after the restart but Thomas missed his attempt at the posts.
The flyhalf then tried his luck with a drop-goal on 54 minutes but that too missed.
But Scarlets did take the lead on 68 minutes as Thomas finally landed his second penalty, his kick going over after striking the left upright.
And just two minutes left Munster full-back Jones spilled the ball twice on his own tryline and opportunist Fenby pounced, Thomas adding the extras for a 13-3 lead.
Thomas then spurned two chances to extend their lead as he was wayward with two more penalties.
But it didn't matter as although JJ Hanrahan added a last-gasp penalty to earn Munster a losing bonus point, Scarlets secured a historic first victory in Cork.
The scorers:
For Munster:
Pens: Keatley, Hanrahan
For Scarlets:
Try: Fenby
Con: Thomas
Pens: Thomas 2
Teams:
Munster: 15 Felix Jones, 14 Doug Howlett (captain), 13 Casey Laulala, 12 James Downey, 11 Luke O'Dea, 10 Ian Keatley, 9 Duncan Williams, 8 Paddy Butler, 7 Niall Ronan, 6 Dave O'Callaghan, 5 Billy Holland, 4 Ian Nagle, 3 Stephen Archer, 2 Mike Sherry, 1 Wian Du Preez.
Replacements: 16 Damian Varley 17 Marcus Horan, 18 BJ Botha, 19 Dave Foley, 20 CJ Stander, 21 Peter Stringer, 22 JJ Hanrahan, 23 Denis Hurley.
Scarlets: 15 Morgan Stoddart 14 Nick Reynolds, 13 Gareth Maule, 12 Gareth Owen, 11 Andy Fenby, 10 Aled Thomas, 9 Gareth Davies, 8 Craig Price, 7 Johnathan Edwards (captain), 6 George Earle, 5 Richard Kelly, 4 Jake Ball, 3 Jacobie Adriaanse, 2 Emyr Phillips, 1 Phil John.
Replacements: 16 Kirby Myhill, 17 Shaun Hopkins, 18 Samson Lee, 19 Johan Snyman, 20 Dan Thomas, 21 Rhodri Williams, 22 Dan Newton, 23 Adam Warren.
Referee: Laurent Cardona (France)
Assistant Referees: M Patton, Eanna O'Dowd (both Ireland)
TMO: Seamus Flannery (Ireland)
Zebre 7-14 Cardiff Blues
Ceri Sweeney's boot proved the difference as he kicked nine second-half points to secure a 14-7 win at Zebre to halt Cardiff Blue's slide which had seen them lose their last four Pro12 matches.
The Italians are still searching for their first ever-win in the competition despite a brave performance after taking a 7-0 lead through Samuele Pace's try midway through the first half.
Prop Nathan Trevett scored his first try for Blues to drag them back into the game as the Welsh side moved up to seventh in the league with the win, leaving Zebre bottom with four points to their name.
And Sweeney was the main difference as he kicked three all-important penalties as Cardiff turned the screw and kept on the pressure in the second half.
The match started evenly but Zebre were given an opening 15 minutes in when Robin Copeland was sent to the sin bin.
The Italians took full advantage of the extra man as just three minutes later centre Pace, who was so impressive in their narrow loss against Ulster, ran through to score his second try of the season.
Fly-half Daniel Halangahu held his nerve to dispatch the conversion as Cardiff inevitably attempted to force their way back into the game.
Cardiff completely restructured their front row for the trip to Italy and the change appeared to pay off as prop Trevett bundled over on 27 minutes although Sweeney failed to take the extra two points.
The rest of the half saw plenty of back and forth between the two teams as Zebre held their own against their more heralded opponents and they missed a great opportunity to open the gap as Gonzalo Garcia saw his penalty slide wide with the last kick of the half.
There was cheer for Blues fans as their reigning player of the year Mike Paterson came on for Macauley Cook five minutes after the restart for his first appearance of the season after returning from operations on both his shoulders.
And there was more to be happy about as a Sweeney penalty put them in front in the 56th minute although he missed another just five minutes later.
But the 32-year-old kicked two more in two minutes with the first in the 68th as the Blues opened up a seven point lead which a spirited Zebre side were unable to reverse.
The scorers:
For Zebre:
Try: Halangahu
Con: Pace
For Cardiff Blues:
Try: Trevett
Pens: Sweeney 3
Teams:
Zebre: 15 David Odiete, 14 Leonardo Sarto, 13 Gonzalo Garcia (captain), 12 Samuele Pace, 11 Sinoti Sinoti, 10 Daniel Halangahu, 9 Tito Tebaldi, 8 Andries Van Schalkwyk, 7 Nicola Cattina, 6 Filippo Ferrarini, 5 Filippo Cazzola, 4 Josh Sole, 3 David Ryan, 2 Andrea Manici, 1 Salvatore Perugini.
Replacements: 16 Carlo Festuccia, 17 Andrea De Marchi, 18 Luca Redolfini, 19 Emiliano Caffini, 20 Filippo Cristiano, 21 Alberto Chillon, 22 Paolo Buso, 23 Ruggero Trevisan.
Cardiff Blues: 15 Dan Fish, 14 Owen Williams, 13 Gavin Evans, 12 Dafydd Hewitt, 11 Tom James, 10 Ceri Sweeney, 9 Lloyd Williams, 8 Robin Copeland, 7 Josh Navidi (captain), 6 Rory Watts-Jones, 5 James Down, 4 Macauley Cook, 3 Taufa'ao Filise, 2 Rhys Williams, 1 Nathan Trevett
Replacements: 16 Marc Breeze, 17 Sam Hobbs, 18 Benoit Bourrust, 19 Michael Paterson, 20 Andries Pretorius, 21 Lewis Jones, 22 Rhys Patchell, 23 Tom Williams.
Referee: Leo Colgan (Ireland)
Assistant Referees: Claudio Blessano, Simone Boaretto (both Italy)
TMO: Mauro Dordolo (Italy)