Sent into bat, Sri Lanka's top-order fired in unison with Fernando hitting a 103-ball 104, the first century for the Island nation in this world cup.
Defending the total, Lasith Malinga struck twice early to leave West Indies at 22 for two in five overs.
"That's been the World Cup for us", West Indies captain Jason Holder said. "It's disappointing, to come so close and not get over the line".
Rihanna's reaction when Chris Gayle got out, head back in disbelief, summed up the overall feeling of the game over at 71-3.
Rihanna supporting the West Indies at Durham. He turned a delivery to short fine leg, belatedly accepted a call for the quick single with Pooran already bearing down on him, and was run out by almost half-length of the pitch. He was well short of his ground at the non-striker's end.
Allen had to be the fall guy, he knew, considering Pooran was one run shy of a milestone 100 at the time.
The batsman was then the victim of Angelo Mathews' first ball in ODI cricket for 18 months.
Sri Lanka's number three had caught the eye against England with a sparkling 49 off 39 balls while he was their joint top-scorer in the heavy defeat to South Africa last time out. I have had a lot of starts in this tournament but not converted. West Indies' hopes of a fast start were dashed when Malinga got rid of both Sunil Ambris and Shai Hope in quick succession.
Sri Lanka's bowler Angelo Mathews, left, celebrates with teammates after dismissing West Indies' batsman Nicholas Pooran for 118 runs during the match.
With that being said, the hundred against the West Indies further shows that Avishka Fernando is one prospect that Sri Lanka needs to stick with and nurture in the years to come.
Fernando will have another chance to shine when Sri Lanka round off their World Cup campaign against India on Saturday. "For now, we are focusing on the World Cup".
England's win over India - who are Sri Lanka's final opponents on Saturday - had ended their knockout hopes before this match. Even though, West Indies is officially out of the race to the semi-finals, the team will look forward to register their second win the tournament.
Off his first delivery a wide one Pooran went after it and edged it to wicket-keeper Kusal Perera and Sri Lanka were once again back in business.
Chelsea beat transfer ban to sign Kovacic
Meanwhile, Chelsea have opted against signing Kovacic's fellow loanee Gonzalo Higuain on a permanent basis. It could prove their only permanent deal of the summer if they're unable to get the ban overturned .