Morgan chose to bat first in preparation for the World Cup and he could not have wished for a better start as England raced to three figures inside 11 overs.
When the usually understated Chris Woakes is impersonating Ian Botham's finger-pointing jig from the 1992 World Cup during his wicket celebrations, and the captain, Eoin Morgan, is still agonising over his final squad with a day to go before the big reveal, you know things have gone reasonably well.
England confirmed their favouritism for the Cricket World Cup as some slick fielding and a Chris Woakes five-wicket haul ensured a series clean sweep over Pakistan. "Every one of these guys should be proud of what we've achieved so far, the continuous improvement of performances throughout makes the selection meeting extremely hard", the Dubliner added.
But a fourth-wicket partnership of 146 ended in frustrating fashion for Pakistan.
Sarfaraz dropped the ball into the legside, Babar wanted a single but was sent back and although Buttler's throw was wayward, Rashid collected it and flicked the ball behind him and onto the stumps.
It was only when Shoaib Malik came on the crease that runs began to flow, but it was a bit too late by then.
Sarfraz was denied what would have been his third ODI hundred in freakish fashion.
Earlier, England were set for a huge score at 191 for two off 25 overs.
But several batsmen got themselves out, including Test skipper Root, who top-scored with 84, and Morgan, making his return to the side.
Morgan hit five sixes and a unsafe No 10 Tom Curran gave the innings a late boost with an undefeated 15-ball 29.
Both openers fell in the 30s, Vince top-edging Shaheen to deep square-leg and Bairstow caught at long-on trying to smear Imad Wasim's left-arm darts down the ground.
Morgan, back after a one-game ban for slow over-rate offences, hit five sixes - including one onto the roof of the Old Pavilion Stand off Mohammad Hasnain - before a mistimed pull off Afridi was caught by Abid.
Root was even closer to a century when he holed out off Hasnain, having faced 73 balls including nine fours.