Pakistan's debutant paceman Tanveer Ahmed claimed three wickets in 29 balls to leave South Africa in a spot of bother at 114-3 at lunch on the first day of the second Test here on Saturday.

The 31-year-old dismissed opener Alviro Petersen (two) off the third ball of his career and then had Hashim Amla (four) off the eighth before removing captain Graeme Smith (10) after Pakistan won the toss and decided to bowl.