Four wickets for captain Jason Holder and half-centuries from Johnson Charles and Jonathan Carter saw West Indies to a comfortable six-wicket World Cup win over United Arab Emirates.
Holder removed UAE's top three in his first three overs and the minnows could only limp to 175 all out, 107 of which came in the seventh-wicket stand as Amjad Javed and Nasir Aziz made half-centuries.
Charles made a brisk start to the chase in partnership with Dwayne Smith and then put on 56 with Carter, who completed the job in an unbroken partnership of 58 with Denesh Ramdin.
The result left the Windies fourth in Pool B on six points and through to a quarter-final against New Zealand. UAE finish bottom, and winless.
Holder won the toss, took one of the two new balls and had Andri Berenger caught behind with the first ball of his second over before removing Amjad Ali and Krishna Chandran in his next.
Opening partner Jerome Taylor clean bowled Khurram Khan and Shaiman Anwar and when Holder ripped out Swapnil Patil, the UAE top six were all back in the pavilion for single-figure scores with only 46 on the board.
Amjad, who already had scores of 42 and 40 to his name in this World Cup, hit an early six off Taylor but made a patient 56 and number eight Nasir scored 60 in his only innings of the tournament to at least give UAE a semi-respectable score.
Nasir was dropped by Holder at slip on 11 and hit a flurry of fours off Kemar Roach before an Amjad boundary off Taylor brought up the hundred.
Nasir's fifty came from 70 balls with six fours and he added two more boundaries before Amjad followed him with a 91-ball half-century featuring seven fours and that one maximum.
Amjad chopped on off Andre Russell for 56 and though Mohammad Naveed got off the mark with a six he fell for 14 from nine balls, before Marlon Samuels dismissed Nasir for 60 and Taylor bowled Mohammad Tauqir for figures of 3-36.
With Chris Gayle ruled out by a back injury, Smith and Charles took 33 from the first three overs before Smith inside-edged Manjula Guruge to keeper Patil.
Guruge also had Samuels caught at point as he took 2-40 but Charles and Carter made good progress towards the mediocre target.
Charles had hit two sixes early in his innings and his half-century came up in 34 balls as he and Carter took the batting powerplay in only the 11th over.
He eventually top-edged Amjad to mid-on, where Krishna took a good catch, but may have done enough to supplant Smith as Gayle's partner once the Jamaican is available again.
Russell was promoted to number five and hit Tauqir for six before quickly gifting Amjad a second wicket. The medium-pacer finished with 2-29 in a creditable all-round performance.
Carter, having been kept in check for a time, moved into the forties with a boundary off Nasir and his half-century came from 58 balls, with five boundaries.
By then just four runs were needed and Ramdin picked them off to finish 33 not out, with West Indies 176 for four from 30.3 overs.
Holder said: "It was a must-win and we were able to accomplish it. We had to show the intent and try to finish the game before 36 overs, which we were able to achieve.
"NZ are obviously playing some very good cricket, so we will look ahead to that (in) the quarter-finals."