Despite a half century opening partnership between Rhys Jones (23) and Adam Lyons (16), Ammanford seconds crumbled to an ignominious 76 all out at Clydach.
Clydach had no difficulty knocking off the runs in just 21 overs, losing only opener Jason Appleby (24) in the process.
Jonathan Donne (16no) and Mckenzie Squires (24no) saw them past the post.
For Ammanford, Matthew Warnes (0 -3 from 5 overs) and Finley Jeffries (0-12 off 6 overs) were efficiently economical. Steffan Phillips (1-24) got the only wicket.
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