South Africa in driving seat

Smith's 104-ball effort and that of Hashim Amla, who made 46, meant the Proteas finished day three on 178 for four, just 27 runs short of their victory target of 205.

The hosts had held their own in the previous two days but Sunday belonged almost exclusively to the tourists, who bowled out Bangladesh for just 182 in their second innings before lunch.

Jacques Kallis took five wickets and Mark Boucher reclaimed the world record for most Test dismissals by a wicketkeeper as the home side capitulated.

Boucher took his 417th Test victim when he caught Mushfiqur Rahim for two off the bowling of Kallis, who finished with figures of five for 30.

Having started the day on 125 for four, Bangladesh were dealt a double blow early on when they lost the wickets of Junaid Siddique (74) and Aftab Ahmed (24).

All-rounder Kallis was in fine form and quickly mopped up the remaining wickets when Mashrafe Mortaza got a thick outside edge to Smith and Shakib Al Hasan (three) edged to Boucher.

South Africa's second innings started well with openers Neil McKenzie and Smith putting on 52 for the first wicket.

But McKenzie eventually perished when he was caught at square leg by Habibul Bashar for 26, while Smith's stubborn knock ended with his side on 125 when he played down the wrong line to a Mohammad Rafique delivery and was given out leg before wicket.

Amla and Kallis followed but Ashwell Prince (24 not out) and AB de Villiers (8no) guided South Africa through to the close without further alarm after bad light brought an end to the day's play.