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.
Sabalenka sees off Kasatkina to reach French Open fourth round
Aryna Sabalenka has cut through the French Open chaos as the world number one beat Australia's Daria Kasatkina 6-0 7-5 on Saturday to seal her place in the fourth round after seismic upsets in the previous two days at Roland Garros.
Parry stuns Anisimova to reach first Grand Slam fourth round at French Open
Diane Parry, the last Frenchwoman standing in the French Open women's draw, has pulled off a stunning 6-3 4-6 7-6(3) victory over American Amanda Anisimova on Saturday, advancing to the fourth round of a Grand Slam for the first time in her career.
Osaka survives three-set scare against teenager Jovic
Naomi Osaka has dazzled with an all-gold outfit but had to dig deep for a hard-fought 7-6(5) 6-7(3) 6-4 victory over American teenager Iva Jovic on Saturday to reach her first-ever French Open fourth round.
Cobolli cruises past Tien in straight sets to snap American's winning run
Italian Flavio Cobolli has dismantled American Learner Tien 6-2 6-2 6-3 on Saturday to advance to the French Open fourth round in commanding fashion.
Liverpool sack Slot after underwhelming season
Liverpool have parted ways with Arne Slot, the Merseyside club said on Saturday after the manager who won the Premier League title in his first season failed to live up to expectations as they finished fifth.
The Ministry of Foreign Affairs is advising UAE nationals and residents to avoid non-essential travel to Uganda, the Democratic Republic of the Congo and South Sudan due to the evolving public health situation related to Ebola.
Authorities have confirmed that the public health situation in the UAE remains stable as it reviews the Ebola virus developments and reinforces its preparedness.
A delegation from the World Health Organisation (WHO) has toured the UAE field hospital in Rafah to review the humanitarian and medical services provided in the southern Gaza Strip amid the ongoing crisis.
