Swansea City Under-21s suffered defeat against Brentford in west London in their Professional Development League clash at Wheatsheaf Park.
Romelle Donovan opened the scoring just after the 10-minute mark for the Bees, whilst teammate Riley Owen doubled the home side's advantage in the 22nd minute.
Former Swans scholar Iwan Morgan tapped home the third and final goal of the clash just after the break.
The Swans did manage to carve out a few chances of their own through Aimar Govea and Sam Parker, but they were unable to make them count.
The visitors had shown three changes to the side that beat Queens Park Rangers last time out. Josh Pescatore and Morgan Bates dropped to the bench, whilst Richard Faakye missed out.
Nathan Tjoe-A-On dropped into the age-grade side to get some game time, while Ben Lloyd returned as captain following a groin injury.
The game opened at a frantic pace, and the Swans had the best of the early chances when Thomas Woodward was just unable to reach Govea's cross.
Swansea keeper Kit Margetson was forced into a diving save to keep out a free-kick from Donovan. However, the Brentford striker would find the net seconds later from the resulting corner, with a powerful effort from just inside the penalty area.
Swans stopper Margetson was called into action again when Owen's cross from an acute angle forced a low one-handed save from the Wales youth international.
But Owen soon got himself on the scoresheet when he broke through the defence and his deflected chip found its way into the net.
Swansea needed a response, and good work from Govea and Woodward ended with the latter getting away a strike from distance that found the side-netting.
The visitors looked set to pull a goal back when Parker was found unmarked in the area, but his effort struck the crossbar and flew out of play.
Brentford were the next to strike as Morgan tapped home to complete a fine team move early in the second half.
The visitors introduced Sammy Henia-Kamau and Morgan Bates just beyond the hour mark, and the pair were quickly involved.
Henia-Kamau's clever flick-on set up Bates, but his final effort sailed wide of the near post.
Approaching the final whistle, Bates' thunderous volley had Julian Eyestone scrambling to pull make a high one-handed save, with Sebastian Dabrowski putting the ball wide from the resulting corner.
Eyestone denied two further chances from the visitors as he prevented Henia-Kamau and Govea finding the net to preserve a clean sheet for Brentford.
Swansea City Under-21s: Kit Margetson, Sebastian Dabrowski (Jack Fanning 85), Nathan Tjoe-A-On, Jacob Cook, Arthur Parker, Iestyn Jones, Sam Parker (Morgan Bates 60), Dan Watts (Sammy Henia-Kamau 60), Thomas Woodward, Ben Lloyd (Josh Pescatore 45), Aimar Govea.
Substitutes: Sam Seager.