The Sri Lanka Under-19 side defeated England by two wickets to win the third One Day game to take a 2-1 series lead.
Chasing a modest 115-run target, the Lankans took 44 overs to win the game.
Angela Bandara top scored with 29 while Dunith Wellalage and Pavan Pathiraja scored 18 and 17 runs respectively.
Thomas Aspinwall and Rohan Ahamed picked up two wickets apiece for the visitors.
Earlier, the Sri Lankan bowlers spearheaded by Wellalage restricted the England youth side for 114 in 34.3 overs. Wellalage picked 3 for 13 while Ravindra De Silva, Trevin Mathew and Yasuru Rodrigo picked up two wickets apiece.
England won the opening game while Sri Lanka clinched the second game of the five-match series.