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.
|Sarri´s mentality made me a better footballer - Jorginho|
|Tax rates played a role in Ronaldo joining Juventus, says LaLiga president|
|Aggressive McIlroy doing it his way, not the fairway|
|I let him have it - Spinazzola ribs Ronaldo over Juve shirt number|
|Thomas makes it back-to-back wins|
|Ramos may remain for Spain but Luis Enrique promising surprises|
|Cazorla still playing through pain after Villarreal appearance|
|Vegas to Carnoustie - a hellish trip for Jhonattan|
|NFL training camp 2018: Five under-the-radar rookies to watch|
|Woods off to a flyer as Thomas charges|
|Sanchez given green light to join Man Utd tour|
|Greipel, Groenewegen and Gaviria latest sprinters to abandon Tour de France|
|Luis Enrique hopeful over Pique as he plots a Spanish evolution|
|I had a brain fart - Spieth disappointed with missed opportunity|
|I´ve sacrificed too much to quit, says injury-plagued Rossi|
|Klopp rejects Henderson´s plea to return early to Liverpool training|
|Open champion Spieth loses ground in scrappy finish|
|Alexis Sanchez hints visa issue sorted as United States trip beckons|
|Kovac an admirer of Pavard, expects James to stay|
|Dzeko happy at Roma and eyeing silverware|
|Eels win basement battle with Bulldogs|
|Kluivert to follow Totti´s example after taking ´big step´ with Roma|
|Kisner hopes to return Claret Jug favour to Spieth|
|FIBA bans 13 players & two coaches over Philippines-Australia brawl|
|Spieth and Rahm in the mix as Kisner sets the target|
|Monchi insists Roma remain ambitious as Liverpool close in on Alisson|
|Cavendish thanks ´race that shaped career & heart´ after cruel Tour exit|
|No Trent Bridge Ashes Test as England confirm schedule|
|Ajax tell Barcelona not even ´insane´ money will buy De Ligt, De Jong|
|Hamilton agrees two-year Mercedes extension|
|Uran withdraws from Tour after failing to shake off injuries|
|Spieth tees off Open defence|
|Zidane has shown no will to coach France, insists FFF president|
|Risking the curse - Steelers star Brown lands on Madden 19 cover|
|Pogba silenced his critics with World Cup displays – Ibrahimovic|
|Warburton overwhelmed by support following retirement|
|Wilshere excited by tactics of Wenger-like Pellegrini|
|Deschamps never considered France exit prior to World Cup win|
|Persepolis eye Champions League after Iran impress at World Cup|
|Sandy Lyle gets The Open underway at Carnoustie|
|Roosters sign England international Hall|
|Ovechkin, Kim earn major honours at ESPY Awards|
|Owens not ´actively seeking´ to play in NFL again|
|Argentina need Messi – Tevez urges Lionel not to retire|
|Minnesota United 2 New England Revolution 1: Ramirez, Quintero sink stuttering visitors|
|Shaw: I want to be first name on Man United teamsheet|
|Manny Machado dealt to Dodgers|
|Pjanic hails Ronaldo arrival but refuses to confirm Juve future|
|Perotti: Roma can cope without Liverpool-bound Alisson|
|Klopp hopes Liverpool building towards title tilt|
|Karlovic exits as four seeds bow out in Newport|
|Angels clap back at Manfred´s marketing comments on Trout|
|Titans DL Casey will still protest despite new anthem policy|
|Popovich on Leonard trade: It´s time to move on|
|Zola returns to Chelsea as Sarri´s assistant|
|Anthony Joshua targets ´dream´ fight in Texas|
|Celtic 3 Alashkert 0 (6-0 agg): Dembele hits brace before injury worry|
|Schwartzman stumbles but Spanish duo reach last eight at Swedish Open|
|Top seeds progress in Bucharest as Larsson conquers Kung|
|Perez promises ´incredible´ signings at Real Madrid|
|Liverpool need a top goalkeeper - Souness|
|It was just an absolute car crash - Root regrets bat-drop celebration|
|Mourinho´s pre-season fears mount with Sanchez sidelined|
|Alisson thanks Roma fans ahead of rumoured Liverpool switch|
|Pogba must understand his World Cup heroics, says Mourinho|
|Odriozola excited by Lopetegui reunion at Real Madrid|
|Revis announces retirement from NFL after 11 seasons|
|The Open 2018 diary: Rahm´s saving Grace, Rory´s going grey|
|Kawhi Leonard traded to Raptors as DeMar DeRozan heads to Spurs|
|Cantona, Rosberg and other surprise retirements after Warburton hangs up his boots|