Mansfield Town’s under 18s fell to their first defeat of 2016 with a 2-0 loss against Chesterfield on Saturday.
John Dempster’s youngsters had their chances in the contest but were met by clinical opposition who made the most of their opportunities to seal the three points in Derbyshire.
The Spireites were ahead after just three minutes, when George Lynam forced the ball over the line from Derek Daley's second corner of the game.
Chesterfield had started the game at a high tempo and only a last-ditch tackle from defender Kane Baldwin prevented Owen Darwent from getting a clear sight of goal.
Tom Jarrald came close to doubling the home side’s lead, when he planted a header just over the bar from another Daley corner.
Mansfield's first chance of the game fell to striker Zayn Hakeem, but having beaten his marker, the Stags’ attacker aimed his shot straight at Dylan Parker.
Defenders Kieran Harrison and Morgan Ratcliffe were doing their level best to keep a dominant Chesterfield attack at bay.
Tom Marsham played Carlton Morrison in on goal, but the Spireites centre forward slipped as he cued up his shot, which allowed 'keeper Sam Wilson to gather the ball.
The Stags only had one more clear chance in the first half, when Tyler Blake fed a sideways pass to the overlapping Tom Marriott, who struck his angled shot well, but Parker saved.
Just before half-time the home side had two more chances, but Morrison inadvertently blocked Owen Darwent's thumping effort from outside the box and Calum Greaves nudged a close range effort over the bar.
Half-time: Spireites 1-0 Stags
Forward Devante Reittie was substituted at the break and former Ilkeston Town man Tyler Johal came on in his place, but the Spireites looked strong in midfield and were making it difficult for Mansfield to create openings in the final third.
But while Mansfield tried to probe a way through for an elusive equaliser, the home side counter-attacked at pace, although Daswell lobbed the ball over Sam Wilson's goal from 12 yards out.
Johal's cross was scrambled away to Cameron Healey on the edge of the box, but his first-time shot was charged down by Lynam.
A Tom Marshall free kick deflected over the Stags’ defensive wall, but Wilson was alert to the danger to palm away.
Midfielder Drew Gibson, on in place of Tom Marriott in the 63rd minute, powered forward and spread the ball wide to Baldwin, but Parker got up well to punch the Mansfield full-back's cross away.
The home side were defending resolutely as the Stags picked up the pace, but their back four and Lynam in particular were in a determined mood.
Harrison looked composed at the back for the visitors and his distribution was excellent, but Mansfield weren't making good use of the ball in the final third.
As the Stags did their best to salvage something from the encounter, Chesterfield left it late to seal their win when Daswell netted from close range inside the final two minutes.
Full-time: Chesterfield Youth 2-0 Mansfield Town Youth
Chesterfield: Dylan Parker, George Lynam, Derek Daley, Tom Jarrald, Jay Smith Tom Marshall, Calum Greaves, Martel Daswell, Carlton Morrison, Owen Derwent, Davis Keillor
Substitutes: Jordan Wells, Ellis Spencer, Joe Rowley, Aaron Mushatt, Harry Taylor
Mansfield Town: Sam Wilson, Teddy Bloor, Kane Baldwin,Tom Marriott (Drew Gibson 63), Morgan Ratcliffe, Kieran Harrison, Cain Smith, Cameron Healey, Tyler Blake, Devante Reittie (Tyler Johal 46), Zayn Hakeem
Substitutes: Adam Bishop, Charlie Shaw, Alistair Smith