A depleted and inexperienced England thrashed Pakistan by nine wickets in a stunning win in the first one-day international in Cardiff.
Saqib Mahmood dismissed opener Imam-ul-Haq with the first ball of the match and had Pakistan captain Babar Azam caught second slip for a duck with the third.
The near full-strength tourists never recovered, seamer Mahmood, playing his fifth ODI, taking 4-42, Craig Overton finishing with 2-23 in his second match and leg spinner Matt Parkinson 2-28 in his third.
In reply, debutant Phil Salt edged to slip off Shaheen Afridi for seven but Dawid Malan and Zak Crawley, another playing his first ODI, cruised to victory with 28.1 overs - more than half the innings - remaining.
Malan ended 68 not out from 69 balls and Crawley unbeaten on 58 from 50 - the pair putting on 120 from 107 balls.
England take a 1-0 lead in the three-match series, with the second ODI taking place at Lord's on Saturday.
New-look England bowlers impress
England's XI was their least experienced since 1985 with just 124 caps to their name - 98 of those to captain Ben Stokes.
Salt, Crawley, Middlesex wicketkeeper John Simpson, Somerset all-rounder Lewis Gregory and Durham fast bowler Brydon Carse were the debutants but it was Mahmood, a relatively experienced head in this team on his 11th international appearance, who impressed most.
The Lancashire fast bowler needed a wise review from Stokes to dismiss Imam lbw first ball, before Babar nicked off with a defensive prod two balls later and debutant Saud Shakeel was trapped lbw to leave Pakistan 26-4 off seven overs.
The 24-year-old bowled with pace throughout, hitting a good length, and his fourth wicket came from a back of the length ball that cramped left-hander Faheem Ashraf from round the wicket before taking an edge.
Overall it was a clinical bowling performance from England's new-look attack.
Gregory, who has previously played seven Twenty20s, shared the new ball and bowled a perfect away swinger to take a thin edge off Mohammed Rizwan's bat in the fourth over. Parkinson chipped in and Overton claimed the final two wickets with bouncers.
Embarrassing defeat for lacklustre Pakistan
Pakistan, ranked sixth in the world, were expected to provide stiffer competition than Sri Lanka, who England swatted aside 3-0 in a T20 series and 2-0 in an ODI series in recent weeks.
Instead, Pakistan they were soundly beaten by England's second string - or even arguably third string when injuries are also taken into account.
The tourists have had no competitive warm-ups before this match and it showed. England bowled well but there were also a number of soft dismissals.
Fakhar Zaman and Sohaib Maqsood hinted at a recovery from 26-4 with a stand of 53 before a terrible mix-up which resulted in Maqsood being run out for 19.
Fakhar top scored with 47 but he tamely cut Parkinson to backward point when his side needed a bigger score.
Even Hasan Ali, Pakistan's number nine, was culpable, hitting a slog sweep to deep mid-wicket off Parkinson, having been dropped playing the same shot two overs earlier.
Welcome runs for Crawley
Zak Crawley made an assured 58 not out on debutThis was only his fourth ODI but Malan eased England to victory with the type of steady innings he has shown in T20s.
Perhaps more significant for England was Crawley reaching his half-century off just 44 balls.
The score-line meant there was little pressure but he played with freedom, hitting seven boundaries all around the wicket.
This unprecedented situation has given Crawley a chance to find form and confidence against the white ball, having had a miserable run in the recent New Zealand Test series, but with five Tests against India to come later this summer.
'A very clinical performance' - what they said
England captain Ben Stokes: "It was a very clinical performance, when you get opposition four down early on then you're ahead in the game.
"When you get a new group together you're striving for that first real team performance. We didn't get put under pressure today, I have no doubt we will at some point. Not every game of cricket goes as smoothly as this."
Pakistan captain Babar Azam: "We were a bit loose with the bat, and that's why we didn't get a big total, but credit to the England bowlers.
"I don't think we misread the conditions - the momentum they got, and the fact we couldn't get a big partnership, is why we didn't get a big total."
Player of the match Saqib Mahmood: "It was a red-ball wicket early on, and early wickets meant we could set more attacking fields.
"Hopefully guys can take confidence from this."
