The home team knocked off a ten-wicket victory in just 33.3 overs after Sri Lanka A had been restricted thanks to a top-order collapse
Apart from the allrounder's second-innings performances, KS Bharat and Anmolpreet Singh contributed heavily with the bat
The visitors clinched the second one-dayer by 67 runs on the back of the allrounder's maiden List A hundred, levelling the three-match series 1-1
Karunaratne, who was ruled out of the ongoing tour of the West Indies with a broken finger, will return to action with the Sri Lanka A squad, which also features Dasun Shanaka, Lahiru Thirimanne and Lakshan Sandakan
Ben Duckett and Daniel Bell-Drummond smashed their way into the record books with the second-highest List A partnership in the world as England Lions cruised to a 140 run win over Sri Lanka A at Canterbury
To many observers, the England Lions top six contesting the Royal London triangular series against Sri Lanka A and New Zealand A loses little in comparison with the senior side
England Lions started off their Triangular Series with New Zealand and Sri Lanka with the sort of win that suggests, for all the sniping, the domestic game is in good order.
So highly rated in county cricket but so emphatically embarrassed in his first Test at the Oval last year, Simon Kerrigan delivered an incisive spell in Colombo that may light his path to redemption.
England Lions have arrived in Sri Lanka's northern-most cricketing outpost hoping to wrap up the unofficial Test series
Chris Woakes was dropped from the one-day team, had a modest Test debut and did not make the Ashes cut. But as captain of England Lions he reminded the selectors of his ability in Kandy
Most runs, most wickets and a lot more