Nottingham Forest's Under 18s suffered a sucker-punch 1-0 defeat at the hands of Cardiff City on Saturday afternoon.
Despite dominating the majority of the game and having the best chances, one sighter was all it took for the visitors to go home with all three points.
Cash found himself at the edge of the area but could only weakly direct his shot towards the keeper and for his second chance minutes later he received a tidy ball from Ryan Yates and on his left foot, curled inches past Joe Massaro's post.
Jack Kelly was the next to try his luck as he fired an audacious 25-yard strike towards goal on his right foot, but it flew just wide.
Forest looked lively in search of a third consecutive victory and defender Joe Worrall saw his header drop into the side-netting. Cash had a wonderful chance before the interval after finding acres of space in the area but the Cardiff keeper made a magnificent instinctive save.
It was much of the same for Kevin MacDonald's men after the break and after lone front man Luke Thomas saw his powerful effort deflected wide, it was beginning to look as if it wasn't to be Forest's day.
That suspicion was increased when The Bluebirds took the lead midway through the second half. The solid Forest defence had rarely been tested but Eli Phipps wriggled free and dispatched it under Joe Boyd's body into the net.
The hosts stepped up the tempo but Cardiff defended solidly. Cash had another glorious chance to level proceedings but the busy midfielder dragged disappointingly wide from close range.
The Reds threw two up top with Gerry McDonagh joining Thomas while winger Liam Adams came on to try and chisel Cardiff's defence down but it wasn't to be on this occasion for the unlucky home side.
MacDonald's side will be looking to bounce back next week as they go on the road to face Bristol City on Saturday (11 October, 12pm kick-off).
Forest: Boyd, Worrall, Arrowsmith, Iacovitti (McDonagh 80'), Kelly, E Otim, Crookes, Cash, Yates, Austin (Adams 72'), Thomas