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.
Chennai's Mhatre makes his mark amid IPL's Suryavanshi-mania
The euphoria around the 14-year-old Vaibhav Suryavanshi has not died down yet and India appear to have unearthed another teenage batting sensation in Chennai Super Kings opener Ayush Mhatre.
Barca keep title bid on track with 2-1 comeback win at Valladolid
Barcelona extended the gap atop LaLiga to seven points with a 2-1 comeback win at relegated Real Valladolid on Saturday thanks to second-half strikes by Raphinha and Fermin Lopez.
Lionel Messi scores as Inter Miami rout Red Bulls 4-1
Luis Suarez and Marcelo Weigandt each had one goal and one assist to help Inter Miami record a 4-1 victory over the New York Red Bulls on Saturday night at Fort Lauderdale, Fla.
Verstappen beats Norris to Miami pole
New dad Max Verstappen showed he could be even faster as a father after storming to pole position at the Miami Formula One Grand Prix ahead of McLaren's Lando Norris on Saturday.
Man City win over Wolves in key game for Champions League qualifying
Captain Kevin De Bruyne scored in his penultimate game at Etihad Stadium as Manchester City beat Wolverhampton Wanderers 1-0 on Friday to climb to third in the Premier League and boost their chances of Champions League qualification.
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The Rock and Chris Evans: A Christmas Surprise!
