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.
Medvedev stunned by wildcard Walton in French Open first round
Daniil Medvedev could not avoid the French Open first‑round trapdoor as he fell 6-2 1-6 6-1 1-6 6-4 to Australian wildcard Adam Walton on Tuesday in a match marked by sharp swings in momentum on the Parisian clay.
Quick and effective: Sabalenka races into French Open second round
World number one Aryna Sabalenka blazed through her opening round at the French Open as she brushed aside Spain’s Jessica Bouzas Maneiro 6-4 6-2 on Tuesday.
Miami says Lionel Messi dealing with ‘overload,’ fatigue in hamstring
Inter Miami star Lionel Messi was suffering from muscle fatigue in his left hamstring when he requested a sub on Sunday during a 6-4 win over the visiting Philadelphia Union, the club has announced on Monday.
French showman Monfils bids adieu to Roland Garros after loss to Gaston
French hero Gael Monfils bade a fond farewell to Roland Garros after going down 6-2 6-3 3-6 2-6 6-0 to compatriot Hugo Gaston in the first round on Monday, departing to loud applause that celebrated two decades of charisma and crowd-pleasing tennis.
Injury rules Spurs' Kudus out of Ghana's World Cup squad
Tottenham Hotspur forward Mohamed Kudus will miss next month's World Cup due to injury after being ruled out of Ghana's preliminary 28-man squad named by Carlos Queiroz on Tuesday.
