The Scarlets boosted their chances of reaching the European Champions Cup quarter-finals by displacing Bath at the top of Pool 5 with an emphatic 35-17 triumph at The Rec.
Bath, though, are facing being frozen out of the last-eight picture after their red-hot opponents ran in tries by lock Tadhg Beirne, wing Paul Asquith and Wales worldwide centres Scott Williams and Hadleigh Parkes. Bath hit back with a tries by Zac Mercer and Mat Banahan, but two more penalties from Jones, to take his match tally to 15 points, rounded off a superb win.
Bath dominated initial territory, but they suffered a major injury blow when their Wales worldwide fly-half and former Scarlets number 10 Rhys Priestland limped off. Kick-off is just over 50 minutes away at 7.45pm.
The Premiership side do have the easier conclusion to the pool stages as they will face bottom side Treviso next week, while Scarlets will have a date with Toulon who are second on points difference. It is all there for Ken Owens side and their magnificent fans will have a huge role to play.
Pre-match omens also, look to be in Bath's favour as 21-year-old wünderkind flanker Sam Underhill returns to action for the first time after suffering a concussion in England's autumn global victory against Australia.
Jones' conversion made it 19-3 and the fly-half then kicked a penalty following a Bath scrummaging offence, with the home side trooping off at half-time after being taught a lesson in terms of ambition, creativity and running rugby.
The first score in the second half was going to be vital and there was no let-up from the Scarlets.