New Zealand knew Angelo Mathews stood between them and a series-clinching victory as the game rushed to its conclusion at Bay Oval yesterday.
The Sri Lankan skipper kept his team alive as the target of 295 got closer, and when he became Matt Henry's fifth victim, caught adroitly on 95 by Henry Nicholls on the mid-wicket fence, the game was up for the tourists.
"We always knew we had to get Mathews," Henry said. "The main process was to deny them boundaries but always attack to take wickets and put a halt to the runs."
The match was also New Zealand's first win in three ODI outings at the ground.
Henry talked down his contribution to the 3-1 series victory.