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.
Anisimova outlasts Swiatek at WTA Finals to join Rybakina in semis
Amanda Anisimova fought past Iga Swiatek 6-7(3) 6-4 6-2 in a winner-takes-all match at the WTA Finals on Wednesday to join Elena Rybakina in the semi-finals and stay in the hunt for a first crown on her debut in the season-ending championship
City's Haaland haunts former club Dortmund, Foden nets two in 4-1 win
Manchester City's Erling Haaland came back to haunt Borussia Dortmund with a clinical finish against his former team, while Phil Foden bagged a brilliant brace as the hosts cruised to a 4-1 win in the Champions League on Wednesday to climb to fourth.
AC Milan, Inter complete acquisition of San Siro for new stadium project
AC Milan and Inter Milan have teamed up to complete the acquisition of the San Siro stadium and surrounding land from the city authorities, in a further step towards demolishing the venue and building a new one, the two clubs said on Wednesday.
Pant returns to India squad for test series against South Africa
Rishabh Pant will make his return to the Indian squad for the two-test series against South Africa, the country's cricket board announced on Wednesday, marking his comeback from a foot fracture that sidelined him from the series against West Indies.
Mac Allister heads Liverpool to Champions League win over Real Madrid
Liverpool's Alexis Mac Allister headed a second-half winner as the hosts earned a hard-fought 1-0 victory over Real Madrid in a battle between European giants on Tuesday, handing the LaLiga leaders their first defeat in the Champions League this season.
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