Pakistan's debutant fast bowler Saqib Khan took seven wickets to dismiss Sri Lanka for 446 on the fourth day of the first Test in Rawalpindi on Thursday.
Saqib grabbed an impressive 7-130 on an overcast morning in Rawalpindi to spark a Sri Lankan collapse which saw the tourists slumping from their overnight 404-4 to 446 all out.
Pakistan, who conceded a slender first innings lead of 12 runs, were 57-1 when bad light and then rain stopped play 45 minutes into the second session.
Opener Azan Awais and Mohammad Taha were the unbeaten batters with 22 and 24 respectively, with the home team now leading by 45 runs with nine wickets intact.
Pakistan had lost opener Tayyab Arif just before lunch, skittled lbw by Asitha Fernando for 11.
With more rain forecast for Friday, the test is heading for a draw, leaving the series result on the second and final match, also in Rawalpindi from November 17.
Saqib, who shone in the overcast morning session, said Pakistan "did not bowl well yesterday".
"The head coach (Mike) Hesson advised us to bowl in the right areas and we followed that plan and were rewarded," he said.
"I have been working hard at domestic level and was waiting for my chance," Saqib added. "It's reward for hard and persistent work that I got seven wickets today."
He started the collapse in the first over of the day when he bagged the prize wicket of centurion Dhananjaya de Silva, caught behind by Ghazi Ghori without adding to his overnight 167.
De Silva hit 20 fours in a 405-minute marathon knock and was soon joined back in the pavilion by Sri Lanka captain Kusal Mendis, who had also reached his hundred on day three.
Kusal, who added 249 runs for the fifth wicket with De Silva, fell to Saqib for 119 in the fifth over after adding just two to his overnight score. He hit 10 fours and four sixes in five hours at the crease.
Sri Lanka lost their last six wickets for 42 runs and Saqib took his fifth when Sonal Dinusha (20) edged to slip.
Saqib then mopped up tail-enders Lahiru Kumara (0) and Asitha Fernando (four) to become only the fourth Pakistani to take seven wickets in an innings on debut.
The others were pace bowler Mohammad Zahid (7-66), off-spinner Mohammad Nazir (7-99) and leg-spinner Abrar Ahmed (7-114).
PAKISTAN: Azan Awais, Tayyab Arif, Mohammad Taha, Babar Azam (capt), Saud Shakeel, Salman Agha, Ghazi Ghori (wk), Arafat Minhas, Razaullah, Mohammad Abbas, Saqib Khan.
SRI LANKA: Lahiru Udara (wk), Passindu Sooriyabandara, Dinesh Chandimal, Kamindu Mendis, Dhananjaya de Silva, Kusal Mendis (capt), Sonal Dinusha, Milan Rathnayaka, Lahiru Kumara, Asitha Fernando, Dilshan Madushanka.