Pakistan fast bowler Shoaib Akhtar made a sensational return to Test cricket after a doping ban as wickets tumbled on the first day of the second Test against South Africa at St George's Park here on Friday.
Shoaib took four for 26 as South Africa were bowled out for 124, their lowest total against Pakistan.
But Makhaya Ntini hit back for South Africa, taking four for 18 as Pakistan stumbled to 135 for six at the close.
Pakistan were looking in control with Younis Khan playing a solid anchor innings before he fended a catch to gully off Ntini in the penultimate over of the day.
Then Kamran Akmal, who shared a 56-run stand with Khan, was out four balls later when he hooked Andre Nel to deep square leg.
Pakistan captain Inzamam-ul-Haq did not bat because of a sore shoulder but will bat on Saturday.
Shoaib prised open the South African batting by taking the first two wickets and was a constant threat, bowling at high pace and exploiting a pitch which offered him steep bounce. He was recorded at speeds of up to 150kmh.