Wales centre Jonathan Davies returned from a nine-month injury absence in Scarlets' 45-12 friendly loss at Bath.
Davies played the full pre-season game but saw little ball as rival captain and former team-mate Rhys Priestland was given far better possession.
England Under-20 wing Joe Cokanasiga scored two spectacular efforts among Bath's seven tries.
Scarlets lost Wales prop Samson Lee to a head knock and South Africa number eight Uzair Cassiem to a leg injury.
Scrum-half Will Chudley (head knock) was a casualty for Bath, whose other tries in a dominant display came from Henry Thomas, Dave Attwood, Jack Wilson, Michael van Vuuren, and Levi Davis, with Priestland converting three and Chris Cook two.
Rhys Patchell and Werner Kruger crossed for Scarlets, Leigh Halfpenny converting one.
Bath are away to local rivals, newly-promoted Bristol Bears in their Premiership opener on Friday 31 August while Scarlets travel to Ulster the following day in their Pro14 opener.
Meanwhile, Scarlets Ladies beat their Bath counterparts 73-7 in a curtain-raiser.
Bath captain Rhys Priestland told BBC Sport Wales:
"Frustrating in that you train in the hottest summer in years, and you play in the wet! But we put into practice a lot of stuff we'd been working on defensively and it was good.
"Jamie Roberts has settled in well, the boys have taken to him and it was his first experience at the Rec, where he hasn't played since he was 17.
"There's no point in looking too far ahead (to the World Cup), I just try to get things right week on week and whatever happens will take care of itself, but I don't wake up in the morning thinking that I need to get back in that (Wales) squad.
"I'll do my best for this club and fingers crossed we hit the road running (at Bristol) on Friday."
Scarlets coach Wayne Pivac told BBC Sport Wales:
"The scoreboard reflected the performance and it wasn't pretty, just too many errors and Bath capitalised on most of them.
"The set-piece was average to poor and our line-out defence wasn't great, and we've got half-a-dozen key players with knocks.
"Guys like Blade (Thomson) and Foxy (Jonathan Davies) having 80 minutes wasn't our intention, but there wasn't much ball-in-play time. Overall very disappointing, a big wake-up call for everyone."