Pakistan were bundled out for 165 by Sri Lanka on Day 1 of the second Test at the Dubai International Cricket Stadium.
Opener Khurram Manzoor made 73, but Pakistan lost eight wickets for 58 runs in 25.4 overs.
In their reply, Dimuth Karunaratne hit seven boundaries in a quick-fire 32 before being trapped lbw by Junaid Khan, who produced a delivery that jagged back alarmingly.
Opener Kaushal Silva and veteran Kumar Sangakkara both reached the close unbeaten on 12, with the final eight overs of the day lost to bad light. The tourists will look to establish a first innings lead on Day 2.