The first match of the series didn't yield any result due to inclement weather.
Chasing a paltry target of 138, India colts knocked off the runs with 103 balls to spare. Almost all the batsmen made contributions with young Jammu lad Shubham Khajuria top-scoring with 34, while vice-captain Sanju Samson contributed 31.
Earlier, Sarfaraz took four for 27 in 7.1 overs and was ably complemented by UP's chinaman bowler Kuldeep Yadav who chipped in with figures of three for 16 after skipper Vijay Zol won the toss.
Sarfaraz, the youngest member of the U-19 side got three wickets during the middle overs to break the backbone of Lankan batting. He first removed Sanjika Ridma (23) followed Thilaksha Sumansiri (2) and R Anurudda (2) as the Islanders slumped from 110 for three to 120 for six, and never recovered from that position.
Only Priyamal Perera (50, 80 balls, 3x4, 1x6) and opener Minod Bhanuka (42, 53 balls, 7x4) made significant scores as seven other batsmen couldn't even cross five before heading back to pavilion.
After Sarfaraz ran through middle-order, Kuldeep came back for his second spell to polish off the tail.
The chase was hardly a problem for the Indian team as young Khajuria curbed his natural strokeplay to hit a patient 34 off 65 balls with five boundaries. His opening partner Akhil Herwadkar (25, 4x4) did the bulk of the scoring during their 39-run opening stand.
Skipper Zol (23), who had an outstanding series, didn't score too many runs today but it was Samson, who hit two fours and a couple of sixes in his 37-ball knock to finish off the match in style.
Brief Scores: Sri Lanka U-19 137 all out in 37.1 overs (Priyamal Perera 50, Minod Bhanuka 42, Sarfaraz Khan 4/27, Kuldeep Yadav 3/16).