RANDY BROOKS / AFP
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.
Poland near World Cup last 16 after beating Saudi Arabia
Poland bolstered their chances of reaching the World Cup's last 16 for the first time since 1986 after goals from Piotr Zielinski and Robert Lewandowski killed Saudi Arabia's efforts to advance a game early.
Australia edge Tunisia in World Cup
Australia beat Tunisia 1-0 at the Al Janoub Stadium on Saturday to register their first World Cup victory in 12 years as they provisionally moved up to second in Group D behind reigning champions France.
US holds England to scoreless draw
The US men's national team tied England 0-0 in Group B play at the World Cup in Al Khor, Qatar on Friday.
Qatar eliminated after Netherlands and Ecuador draw
Qatar became the first team to be eliminated from the World Cup on Friday after Group A rivals the Netherlands and Ecuador drew 1-1.
Senegal win puts hosts on brink of World Cup elimination
Senegal secured a 3-1 victory over hosts Qatar in their World Cup Group A clash at Al Thumama Stadium on Friday.
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