Ben Duckett scored a majestic 167 to help England set a commanding total of 386-5.
Pavan Rathnayake hit a brilliant 118 off 77 balls for Sri Lanka in a losing effort.
England secured a 55-run win after Sri Lanka lost their final wickets quickly.
Sri Lanka advances to face Pakistan in the tri-series final on Sunday.
Read the full story on NexVani Media