India's Harbhajan Singh grabbed two big wickets in successive overs to spark Pakistan's collapse in the second Test here on Sunday.
The off-spinner dismissed overnight batsman Salman Butt and prolific scorer Mohammad Yousuf as Pakistan struggled to reach 154-5 in their first innings at lunch on the third day in reply to India's mammoth 616-5 declared.
Veteran leg-spinner Anil Kumble and fast bowler Munaf Patel also kept pressure on the batsmen, taking one wicket apiece.
Pakistan, trailing 1-0 in the three-Test series, lost four wickets for 104 runs in the morning session in a dismal batting display after resuming at 50-1. They still need 263 more runs to avoid a follow-on.
Misbah-ul-Haq (35) and Kamran Akmal (two) were batting at the interval.
Harbhajan's first victim was left-handed Butt (42), who attempted to drive but was beaten by the flight and turn to be caught by former captain Rahul Dravid at the lone slip. Butt added 16 to his overnight score of 26.
The tourists suffered another setback when Yousuf (six) was bowled between bat and pad after being beaten by the sharp turn, leaving his side in trouble at 85-3.
Stand-in captain Younis, three overnight, counter-attacked in a bid to ease the pressure as he smashed one six off Harbhajan and five fours in his 43 before falling to a rash stroke.
Younis, leading the side in the absence of unfit Shoaib Malik, was caught behind trying to drive an away-going delivery from Patel.
Misbah continued to play shots under pressure and was lucky to survive on 22 when Sachin Tendulkar dropped a catch at mid-wicket off Kumble.
The leg-spinner did not have to wait long for a wicket, trapping Faisal Iqbal leg-before for a duck in his next over.