Inserted into bat by Sri Lanka 'A' captain Jehan Mubarak, the, Pakistanis piled up a formidable 290 for five off their fifty overs.
Test discard Hasan Raza, Ashar Zaidi and skipper Misbahul Haq were all amongst the runs chipping in with half-centuries.
Openers Ashar led the way with a solid 64. His fellow opening partner- Faisal Athar also played a good part scoring an enterprising 38 as they provided the perfect platform for the tourists with a stand of 84.
Skipper Misbah struck a belligerent 62 off only 56 balls while striking six fours and two sixes. But it was Pakistan 'A' vice-captain Hasan Raza gave the spark to the Pakistan innings towards the end clobbering a breezy 74 off 56 deliveries, cracking nine boundaries and two huge sixes.
Sri Lanka 'A' were quite in the hunt as they made a disastrous start plunging to 78 for one six in the 13th over. They never recovered from the early blows and were packed out for 213.
For Pakistan, leggie Imran Tahir and part-time left-arm medium-pacer , Ashar, ran through the tail in just six overs to leave Sri Lanka 'A' rooted to the bottom of the standings.
For Sri Lanka 'A' Michael Vandort sparkled in a lost cause hitting 72 off 79 balls while Test discard Russel Arnold, contributed 68 as they raised 71 for the fourth-wicket after Mubarak was stumped off the very first ball he faced.