Jason Roy and captain Joe Root both smashed centuries as the tourists easily reached their target of 361 with eight balls to spare in Barbados.
It was their highest ever run-chase in the format.
Chris Gayle's innings of 139 off 129 balls went in vain as the Windies' poor form in ODI cricket continued.
The second encounter of the five-match series will be played on Friday.
Pogacar wins third Flanders crown but faces fine for running red light
Tadej Pogacar has clinched a record-equalling third Tour of Flanders title on Sunday, but the Slovenian could face a fine from local authorities after running a red light at a railway crossing.
Thuram and Martinez star as Inter dismantle Roma
Inter Milan delivered a ruthless attacking masterclass to dismantle AS Roma 5-2 at home on Sunday, tightening their grip on the Serie A title as Marcus Thuram and Lautaro Martinez spearheaded the rout.
Silva to exit Man City at end of season, assistant manager confirms
Manchester City captain Bernardo Silva will leave the club at the end of the season, assistant manager Pep Lijnders confirmed on Sunday.
Penalty heroics help Leeds beat West Ham to reach FA Cup semis
Leeds United goalkeeper Lucas Perri saved two penalties as they edged past West Ham United 4-2 in a shootout, after their FA Cup quarter-final tie ended 2-2 after extra time.
Pogačar wins Tour of Flanders for record-equalling third time
Tadej Pogačar won the Tour of Flanders for a third time on Sunday, cementing his place among cycling’s all-time greats with another dominant performance.
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