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