Guptill scored 58 from 34 balls to give New Zealand the high-tempo start it needed after Sri Lanka won the toss and elected to bowl first. Williamson supported him with 53 from 42 balls to lead New Zealand to 182-4.
In reply, Danushka Gunathilaka made 46 and Milinda Siriwardana 42 to help Sri Lanka keep things close into the final over. But Grant Elliott held his nerve and bowled a steady last over that saw Sri Lanka lose two wickets and fall just short at 179-9.
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