"It's just great to see him transfer that into the international arena. He looked calm and he played the spinners well - that was the key for us."
Sri Lanka skipper Kumar Sangakkara admitted his side were always under pressure once an impressive opening burst from James Anderson (3-20) and Graham Onions (2-58) had seen them hit severe trouble at 17-4.
"It was a good total from where we were," said Sangakkara.
"But it didn't seem enough with the wicket easing off towards the end of the match. There wasn't much spin in the wicket, but I think we still bowled well, especially Ajantha.
"We have a bit of homework to do before the next game."
While England were delighted to see a wicket that played into their hands, Sangakkara was less complimentary about the conditions.
"The wicket was not the best for one-day cricket, especially if you want to attract fans to the one-day game," he complained.
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