SWANSEA CITY U18s: Lewis Thomas, Ben Jones, Luke Llewellyn (Jordan Sherman, 81), Jamie Latham, Joseph Jones, Thomas Atyeo, Stephen Fallon, Corey Francis, Kyle Copp, Alex Samuel (Connor Peters, 70), Keston Davies.
SUBS: Dylan Thomas, Cameron Gilchrist, Lewis Moore.
OXFORD UNITED U18s: Barney Martin (Rory Golden, 1), James Clarke, Freddie Grant, Josh Ashby, Robbie Cundy, Cian McCormack, Greg Hackett, Adriel George, James Roberts, Jamie Calvin (George Jeacock, 89), Sam Humphreys.
SUBS:Muctary Conte, Seth Humphries, Miles Welch-Hayes.
Oxford United were forced into making an early change, just five seconds into the game, when goalkeeper Barney Martin collided with Kyle Copp. The visiting side brought on Rory Golden to replace the injured shot-stopper.
Despite the almost instant setback, the visitors had the first sighting of goal when Greg Hackett centred for Jamie Calvin in the box. The young striker did well to meet the driven cross, but could only direct his header over the bar.
The Swans responded to Oxford's early pressure well, and the home side's first chance came when Copp fired a free-kick wide after Stephen Fallon was fouled on the edge of the area.
Fallon caused yet more problems for the opposition when he got behind the visitors' defence for a second time in ten minutes. The winger latched on to a well-timed through ball, but skewed his effort well wide of the target.
Then, just inside the half-hour mark, the Swans took the lead when Copp curled home a magnificent free-kick from the edge of the area - the opposite side to his first attempt.
But Swansea's lead lasted just eight minutes when Josh Ashby converted a penalty after James Roberts was brought down in the area by Swans 'keeper Lewis Thomas. Ashby drilled his spot-kick into the right-hand bottom corner, giving Thomas no chance.
On the brink of half-time, the visitors went in front when Jamie Calvin side-footed home after good work down the left flank by Sam Humphreys. The goal came moments after Calvin had a scrambled effort cleared off of the line by Tom Atyeo.
HALF-TIME: Swansea City 1-2 Oxford United
Both sides went close to scoring, early on in the second-half. The Swans almost had a chance to equalise, straight from the restart, when Fallon's cross was spilled by Golden. But the Oxford defence did well to clear their lines, just as Copp was about to pounce.
Then, at the other end, Roberts very nearly got his name on the score sheet, only to see his strike hit the post after he had skipped past Atyeo to go through on goal. The rebound fell to goalscorer Calvin, but the striker hit his shot into the ground, with the ball bouncing up into the grateful arms of Thomas.
With 15 minutes left on the clock, the Swans were dealt a huge blow to their qualification chances when Keston Davies received a second yellow card for a foul on Hackett.
And Oxford didn't wait long to make their one man advantage pay. Just moments after Davies received his marching orders, Ashby's in-swinging corner was met by a thumping header from Robbie Cundy, making it 3-1 to the visitors.