Shoaib Malik and Babar Azam made short work of Pakistan's chase after Hasan Ali celebrated becoming the world's top-ranked ODI bowler by ripping through Sri Lanka.
Hasan has gone from strength to strength since playing a key role in Pakistan's stunning Champions Trophy win and he took 3-37 to set the nominal hosts in Sharjah on their way to an eighth straight 50-over win.
Sri Lanka are also on a sequence of results in this format, although one much more painful, and they never looked like preventing a losing run slipping to an 11th match after being bowled out for 173.
After Hasan's heroics, Babar and Malik each scored 69 not out, putting an unbeaten 119 runs on for the fourth wicket and sealing victory and putting Pakistan in sight of a series whitewash in the fifth and final contest, with Sri Lanka hoping to avoid successive blowouts in ODIs.
Sri Lanka's innings was sapped of momentum from the off, with Upul Tharanga (0) and Niroshan Dickwella (22) falling in the powerplay.
Lahiru Thirimanne scored 62 but his resistance was the only real nuisance for Pakistan, who twice took two wickets in an over - Dinesh Chandimal (16) and Sadeera Samarawickrama (0) falling in the 11th, while Shadab Khan (2-29) enjoyed immediate success, snaring Seekkuge Prasanna (5) and Thisara Perera first ball with his opening two deliveries of the match.
Sri Lanka were 99-7 at that point, with only useful cameos from Akila Dananjaya (18) and Suranga Lakmal (23 not out) alongside Thirimanne helping them to something resembling a decent target.
It proved wholly insufficient, however, Pakistan riding out the cheap dismissals of Imam-ul-Haq (2), Mohammad Hafeez (9) and Fakhar Zaman (17).
Babar and Malik took their time to get going and the latter had a life on three when a chip to mid-on burst the hands of Thisara.
Malik was back in the groove by the time he launched Dananjaya 93 metres over midwicket and Sri Lanka's limp performance soon extended to their bowling and fielding as Pakistan were allowed to calmly chip away at their target.
With victory in sight, Malik delighted the crowd with a sumptuous blast over extra cover for another maximum, and his third six finished the match as Pakistan sealed the win with 11 overs unused.
|Notorious Carnoustie holds fond memories for legendary Watson|
|Rooney refused to be ´dead weight´ at Everton|
|The Open 2018: Molinari, Rahm and the in-form contenders at Carnoustie|
|Marsh interested in Australia leadership roles|
|United can challenge City for Premier League title, says Rooney|
|MLB All-Star 2018: Seven things you missed at Midsummer Classic|
|American League win home run-filled MLB All-Star game|
|Dragons lure Sims from Broncos|
|Cassano: Ronaldo like Nadal, Messi like Federer|
|Lakers´ Ball undergoes successful knee surgery|
|´We kill them, Messi or no Messi´ - Pogba´s pre-Argentina World Cup speech revealed|
|Cardinals suspend GM Keim for five weeks after DUI|
|Dalic: I can coach Brazil or Barca but Croatia my favourite|
|Warriors coach Kerr extends contract|
|I´m ready to bust him up - Miller calls out Joshua after New York confrontation|
|CAF Champions League Review: ES Tunis and TP Mazembe set the pace|
|Mixed day for seeds in Newport as Muller progresses|
|Rams sign Cooks to five-year extension|
|Cowboys’ Randy Gregory reinstated by NFL|
|Verdasco survives Swedish Open scare as Paire is picked off in Umag|
|US Open announces record prize fund for 2018|
|Stosur wins battle of former grand slam champions in Gstaad|
|Emery is Arsenal´s best signing, says Pires|
|Brewster commits to Liverpool with long-term deal|
|Panama boss Gomez steps down after World Cup|
|No Chelsea agreement for Golovin, claims CSKA president|
|Root looks right at home as England ease to series victory|
|Brighton sign Mali midfielder Bissouma from Lille|
|Kaka backs Brazil boss Tite after ´excellent´ World Cup|
|Alaphilippe the toast in France as Van Avermaet increases Tour lead|
|Shkupi 0 Rangers 0: Gerrard´s men advance despite dour draw|
|Khazri ends Sunderland nightmare as Saint Etienne swoop|
|The Open 2018 diary: Rose lets Rio go as Rahm goes ´Lefty´|
|Lampard raids Chelsea and Liverpool in Derby double swoop|
|Balotelli returns to Nice training after Marseille talks stall|
|Owens wants to play in the CFL, says agent|
|I don´t like thinking too much - Johnson|
|Toulon president fined as French club receive suspended points penalty|
|Top of the flops - Mickelson plays exquisite trick shot over man´s head!|
|Kerber targeted Wimbledon after 2017 disappointment|
|England´s World Cup heroes given dedicated parking spots|
|Insigne prefers Messi to new Juve star Ronaldo|
|Koepka enjoys playing with a chip on the shoulder|
|Ryan Hall to leave Leeds Rhinos amid reports of NRL move|
|Hamann slams Lahm for Low criticism|
|Hart named in Manchester City squad for United States tour|
|F1 Raceweek: Leader Vettel heads home|
|Unfair to pin Brazil blame on Neymar, says Kaka|
|Thomas and friends ´want to beat each other´s brains in´|
|Woods´ love for links fathered at Carnoustie|
|Confident Rose targets tournament wins and number one spot|
|Hallgrimsson leaves Iceland post|
|Australian Open to consult players over fifth-set tie-breaks|
|Daley´s coming home - Ajax rewrite Three Lions anthem|
|Woods: Open my best chance at winning another major|
|Blind completes Ajax return from Manchester United|
|I belong at the top, says Anderson|
|Leaving Madrid was my biggest regret, Panucci warns Ronaldo|
|Folau in no rush to settle future amid Reds rumours|
|Degenkolb: I need two or three secretaries to manage congratulations!|
|Harrington v Garcia: When winning makes life tougher|
|Mafi and Timani fined by Rebels|
|Watson: Johnson and Woods can prosper at Carnoustie|
|Alderweireld hints at Tottenham departure|
|Maradona takes over as Dynamo Brest chairman|
|The Open 2018: Wounded animal Spieth is a danger to Carnoustie rivals|
|Wests´ Reynolds to miss the rest of 2018|
|Pussy Riot members jailed for World Cup final protest|
|Ronaldo capture boosts Serie A - Mourinho|
|Goals at three World Cups and 50 for the Socceroos – Cahill´s international career in numbers|