New Zealand made it three wins from three as Jimmy Neesham and Lockie Ferguson found form with the ball in a seven-wicket win against Afghanistan.
Kiwis Neesham and Ferguson ran through the top and middle order as Afghanistan was all bowled out for 172.
Despite losing Martin Guptill and Colin Munro cheaply, New Zealand coasted to their 173-run target with 107 balls to spare.
Captain Kane Williamson led the way with an unbeaten 79 from 99 balls.
Williamson and Ross Taylor added 89 for the third wicket, ensuring the Black Caps were well on course to win before the new permanent floodlights at Taunton could take full effect.
Afghanistan fell to their third defeat in three matches, falling short with the bat and proving error-prone in the field once again.
That was despite some entertaining flourishes at the top of the order from Hazratullah Zazai and Noor Ali Zadran and a gutsy half-century from Hashmatullah Shahidi.
Seamer Aftab Alam also showed his potential, taking all three of New Zealand’s wickets.
But they were hampered by the loss of leg-spinner Rashid Khan midway through the game with a head injury, caused when he was hit on the helmet and bowled for nought after ducking into a short ball from Ferguson.