Port Vale travelled to South Wales with hope of snatching a result that would ease the relegation pressure, only to be undone by a set-piece with twelve minutes left on the clock.
Darren Moore set his side up in the 4-2-3-1 that has served them well recently. Vale shaded the first half for long stretches.
The decisive moment came from a corner. Vale defended the first ball but couldn't clear the second.