The league-leading Ospreys delighted a packed Gnoll with a bonus-point win in the big west Wales Boxing Day derby.
Ospreys (11) 28
Tries: B Williams, S Williams (2), Bater
Con: M Jones
Pens: Henson (2)
Scarlets (7) 7
After a Jon Mills try in an early Scarlets onslaught, Shane Williams inspired a Barry Williams score for an 11-7 half-time lead to the Ospreys.
Clinical second-half finishing saw a brace for the outstanding Shane Williams and a try for James Bater to reward a powerful pack performance.
Andy Millward and Chris Wyatt were sin-binned in an often fiery encounter.
The Scarlets dominated the opening exchanges and should have got a fifth-minute try, but wing Aisea Havili dropped the
The visitors increased the pressure when Ospreys prop Millward was sin-binned for a swinging arm at a ruck.
The home side's defence remained solid and disciplined, though, and with Duncan Jones dominating ex-All Blacks prop Dave
Hewett at the scrum they stayed in the game.
With the help of Matthew Jones' accurate line kicking and strong ball-carrying work from the front row, the Ospreys gradually
found a foothold in the opposition half.
The Scarlets failed to show the defensive control of the home side, putting their hands in at the ruck to gift Gavin Henson
two easy penalties.
The Llanelli side fired back with a rolling maul from an attacking line-out.
The initial drive looked to have been held, but the ball popped out to Mills on the wing who found himself clear for a canter
in for his first Scarlets try.
Duncan Jones was at the heart of an awesome Ospreys pack
Straight from the restart a loose Scarlets kick came to Shane Williams deep in his own half, allowing the Wales wing to set
off on a dazzling, side-stepping run.
He found Brent Cockbain in support, and the ball went through the hands of Millward, Duncan Jones and Jon Thomas before
reaching Barry Williams who crossed for a spectacular score.
The Ospreys had chances to extend their lead before the break, but poor goal kicking from Henson and Matthew Jones let them
That was soon forgotten as a loose Scarlets kick-off at the start of the second period gave the Ospreys the position for
Shane Williams to side-step past Gareth Bowen in midfield and sprint in for the second try.
Excellent driving play from an attacking line-out set up the impressive James Bater for the next score to put the game out of
the visitors' reach.
The Scarlets' problems increased when Wyatt was yellow carded for a reckless stamp on a player on the floor.
The penalty was kicked to touch, and when the forwards delivered messy ball back into midfield Shane Williams was able to
step over from close range for the bonus-point score.
The Ospreys forwards retained an iron grip for the rest of the game, but the home side failed to add to the score-board as
they looked for the spectacular finish.
The final word was left to man-of-the-match Shane Williams, whose superb cover tackle in the corner denied Tal Selley a
"I was apprehensive at the start and they came at us strongly, but they didn't get the points and there was only one team in it at the end," said Ospreys coach Lyn Jones.
"We felt they were starting to crack at half-time and that we just had to maintain the pressure, and our score at the start of the second period nailed it.
"There were a lot of bragging rights on this game, so hopefully we've sent the fans home happy."
Scarlets director of rugby Gareth Jenkins said he had no compaints with the result.
"The first 10 minutes of the second half changed the game," Jenkins told the BBC.
"Shane Williams was devastating, his individual brilliance broke our defensive pattern.
"We failed to take our chances in the first half and didn't have enough to build a platform on."
Ospreys: A Durston; E Seveali'i, S Parker, G Henson,
S Williams; M Jones, J Spice; D Jones, B Williams (capt), A Millward,
B Cockbain, J Thomas, J Bater, R Pugh, R Jones.
Replacements: R Hibbard, A Jones, A Newman, A Lloyd, R Rees, D Bishop, D Tiueti.
Scarlets: G Evans (capt); A Havili, M Watkins, S Finau, T Selley; G Bowen, D Peel; P John, R McBryde, D Hewett, V Cooper, C Wyatt, D Hodges, J Mills, D Jones.
Replacements: J Davies, M Rees, B Griffiths, A Powell, M Phillips, A Thomas, B Davies.
Referee: Nigel Whitehouse (WRU)