Root, promoted to open in absence of injured Roy, becomes first England batsman to score three WC hundreds
Morgan (back) & Roy (hamstring) both injured and don't bat in England's run chase
Windies bowled out for 212 in 44.4 overs - Pooran 63, Wood 3-18, Archer 3-30
Russell and Gayle were both dropped - England have now dropped as many catches as Pakistan in this WC (8)
Stephan Shemilt
BBC Sport in Southampton
Image source, Getty ImagesThere are a number of guitarists playing cricket bats at each of the games in this tournament. Southampton's is by far the best. He's just nailed Summer of 69.
This is the first time England have won an ODI without hitting a six since they played Ireland in 2017.
#bbccricket
Simon Morrison: Forget Botham, Flintoff and Stokes, this Root kid is the best all rounder I’ve ever seen.
Just the 101 balls left over at the end...
Michael Vaughan
Ex-England captain on BBC Test Match Special
This England side know how to win, they've been doing it for four years.
"Well in son, nice," says Mark Wood as he congratulates Joe Root on the boundary rope.
That's a proper thrashing.
England were without their opener, their captain had a mid-match back spasm, and they've still cruised to victory.
Michael Vaughan
Ex-England captain on BBC Test Match Special
England have put in a really good performance. When you think a couple of players had to limp off.
It was a good toss to win, the conditions this afternoon have been totally different from this morning. A wonderful display.
Sometimes the West Indies arrive and don't look like they want to be there.
Image source, ReutersSealed with a Ben Stokes four!
Joe Root finishes on an unbeaten 100, Ben Stokes on 10 not out, and that is an easy a run chase as you'd like.
Here it comes...
Four!
Ben Stokes isn't hanging around. A push through deep extra cover goes flying away, and it's a no ball!
It is honestly astonishing that it's taken this long for an England player to make three World Cup centuries.
England have been so very bad in this format.
Andy Zaltzman
Test Match Special statistician
That was Joe Root's 16th hundred in ODIs, it came from 93 balls with 11 fours.
It's his fourth v West Indies and his third in World Cups - the most for any England player.
Image source, ReutersJason Holder is bringing himself back on.
Michael Vaughan
Ex-England captain on BBC Test Match Special
What's pleasing is seeing Eoin Morgan on the balcony stood clapping that ton. What an innings. Joe Root hasn't broken sweat.
He just plays with so much simplicity.
Image source, Getty ImagesNeed nine runs to win
This has been effortless from Joe Root. What a performance, especially opening the batting for the first time for England in one-day cricket.
Century number two in this tournament for Joe Root!
What a player. As easy as you like. He's got there in 93 balls, with 11 fours.
Need 11 runs to win
Ben Stokes hooks a single to get Joe Root back on strike.
A firm pull through backward square by Joe Root...
...but it's only a single! Root goes to 99.
Joe Root, on 98, will face Oshane Thomas...