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.
Sri Lanka, who won the toss and decided to bowl first, were 57-1 in their reply.
Nuwan Pradeep made the early breakthroughs, trapping opener Ahmed Shehzad lbw for three before Mohammad Hafeez was bowled through the gate for 21 just after lunch.
Manzoor brought up his half-century, his sixth in Test cricket, off 83 balls. However, Pakistan then lost their two key batsmen in quick succession.
Shaminda Eranga had Younis Khan (13) and captain Misbah-ul-Haq (1) caught behind by Prasanna Jayawardene.
Manzoor offered Jayawardene his third catch when he edged Suranga Lakmal after a 136-ball stay at the crease. Only Bilawal Bhatti, with an unbeaten 24, reached double figures of the remaining six batsmen.
Seamers Lakmal, Eranga and Pradeep combined for seven wickets with slow left-armer Rangana Herath taking out the tail to finish with 3-26.
|2nd Test: Pakistan v Sri Lanka at Dubai|
|Pakistan 1st Innings: 165 all out (63.5 overs)|
|Manzoor||c P Jayawardene||b Lakmal||73||217||136|
|Y Khan||c P Jayawardene||b Eranga||13||43||29|
|Misbah-ul-Haq||c P Jayawardene||b Eranga||1||8||7|
|Shafiq||c Silva||b Lakmal||6||42||34|
|Sarfraz Ahmed||c P Jayawardene||b Pradeep||7||27||16|
|Ajmal||c Silva||b Herath||8||17||10|
|Rahat Ali||lbw||b Herath||0||2||4|
|Junaid Khan||lbw||b Herath||2||24||12|
|Extras||0nb 0w 0b 7lb||7|
|Sri Lanka 1st Innings: 57-1 (16 Overs)|
|Karunaratne||lbw||b Junaid Khan||32||46||43|
|Extras||0nb 0w 0b 1lb||1|
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.
The opening match of the three-Test series in the UAE was drawn.