SL remain winless after 35-un loss. New Zealand recovered from 27/4 to post 179 after being asked to bat.
New Zealand will look to finish a high by winning the one-off Twenty20 International against Sri Lanka as well.
Tons for Ross Taylor, Henry Nicholls as Black Caps sweep Sri Lanka ODI series.
Sri Lankan all-rounder Thisara Perera, who scored a 74-ball 140, was the last to depart.
Tim Southee to captain New Zealand side in shorted format against Sri Lanka.
New Zealand seal 45-run win after ton from Guptill and half-centuries from Williamson and Taylor, takes 1-0 lead.