England have never recorded a one-day international whitewash in the Caribbean, 36 years on since their first attempt.
But one more victory in Barbados today, after back-to-back successes over their inexperienced hosts in Antigua, will set that record straight.
Roy, likely to be in company for the first time on this tour with his fit-again opening partner Alex Hales, is one of England’s biggest weapons.
Fielding coach Paul Collingwood, who previously led England to their only global trophy to date in the West Indies at the ICC World Twenty20 seven years ago, spoke in a broadcast interview this week of his awe at the power in the current line-up – and specifically of Roy’s “brute strength”.
The opener demonstrated all of that with seven fours and a six in his 48-ball 52 as England sealed the series with a four-wicket win at the Sir Vivian Richards Stadium.
Roy was annoyed at himself for failing to go on to a century, and leaving Yorkshire’s Joe Root and Chris Woakes with lots of work to do after a middle-order collapse followed his own dismissal – caught on the long-on boundary off Ashley Nurse.
He insists nonetheless he will carry on attacking.
“It was just execution (that was wrong),” he said.
“That’s all it was – 10 rows back and it’s a different story. But that’s the way I play my cricket, I push myself and I push the boundaries.”
England want him to do just that, en route to this summer’s Champions Trophy.
For Roy, though, the aim is not just to keep hitting the big shots but to make sure he can do it for longer – having registered six ODI half-centuries without going on to a hundred since his career-best 162 against Sri Lanka at The Oval last summer.
“That’s not the way I want to be known as a cricketer,” added the 26-year-old.
“I want to be known as a guy who is going to win matches and score big hundreds, be that solid guy at the top of the order.
“Yes, make quick 50s and 60s every now and then – but big hundreds are at the forefront of my mind. I’m extremely driven (to do that).
“Last summer was frustrating again, getting 50s and getting out.
“Big hundreds are what win you games.”
The more important prize of a consolation victory, for the West Indies, however, will come in the shape of points in the International Cricket Council rankings, which may well prove the difference between qualification or otherwise for the next World Cup in 2019.
Once the powerhouses of world cricket in all formats, have won two of the last three ICC World Twenty20s but are already resigned to sitting out this summer’s Champions Trophy.
“We’re definitely focused for tomorrow,” said captain Jason Holder.
“There’s obviously still a lot to play for.
“Every point is crucial now, going into the World Cup qualification – and that’s the way we’re seeing this game.”