Lahore:South Africa marched toward setting up a stiff target for Pakistan in the second Test on Wednesday.
The visitors were 154-2 at stumps on day three - enjoying an overall lead of 305 runs with captain Graeme Smith batting on 75 and in-form Jacques Kallis not out on 37.
Pakistan - already trailing 1-0 in the two-match series -suffered a big blow when its fast bowler Mohammad Asif could bowl only four overs in the second innings before he was sidelined due to elbow injury.
"He will see the doctor tomorrow and only then we could say whether he could take further part in this test or not," manager Talat Ali said.
Smith completed his first half century of the series and hit 11 boundaries and Kallis, who has already scored 155, unbeaten 100 and 59 in the previous three Test innings, played some attractive drives in his undefeated knock.
Both added 88 runs in an unfinished two-hour partnership as the day's play ended due to fading light seven overs before the scheduled close.
Earlier, fast bowler Makhaya Ntini (3-42) grabbed all his wickets in one over just before lunch to restrict Pakistan at 206, 151 runs adrift of South Africa's respectable total of 357.
Left-arm spinner Paul Harris also finished with 3-57 as he wrapped up Pakistan's disappointing innings in the first over after lunch when last man Asif was caught close to the wicket.
"We are in a great position, it's not an easy wicket to bat on and chasing a target will not be easy," Harris said.
"The wicket is very up and down, there is more rough and it's definitely deteriorating," he added.