Scarlets have won their last four games in the RaboDirect PRO12, whilst their only defeat in the tournament at Parc y Scarlets in their last 13 fixtures was 16-23 to Ospreys on 21 September. No Irish province has won at the stadium since Leinster were the visitors on 24 September 2011.
Ulster's superb unblemished start to the 2012/13 campaign continues apace with eleven straight wins in all competitions. The Ulstermen are attempting to complete a clean sweep of victories away from home to the Welsh regions this season.
The last three matches between the two sides have all been won by the home side on the day, whilst Ulster's only win in Llanelli came on 18 February 2011.
At Parc y Scarlets , 4pm.
Referee: Peter Fitzgibbon (IRFU, 43rd competition game)
Assistant Referees: James Jones, Chris Williams (both WRU)
Citing Commissioner: Aurwell Morgan (WRU)
TMO: Nigel Whitehouse (WRU)
Live on S4C and RTE SPORT