Graeme Smith and Neil McKenzie set a world record opening stand of 415 as South Africa cruised to 509-1 in the second Test against Bangladesh.

Resuming on 405 in Chittagong, skipper Smith struck a single in the third over of day two to take himself and McKenzie to the new mark.

The previous best of 413 was set by India's Pankaj Roy and Vinoo Mankad against New Zealand in Chennai in 1956.

Smith was out just nine balls later for 232 when he was bowled by Abdur Razzak.

McKenzie reached 223 not out - his highest Test score - at the interval, while Hashim Amla was unbeaten on 35.

All eyes were on the record as the tourists resumed this morning requiring just nine runs.

Smith, captaining the side for a record 54th time, bludgeoned a boundary off Shakib Al Hasan in the opening over of the day before retaining the strike with a single.

The left-hander notched two further runs before a single from McKenzie brought the pair level with the 52-year-old mark.

Smith wasted little time before stroking a single past square leg four balls later to break the record.

But just one run later the partnership was broken by Razzak as Smith was bowled trying to sweep the slow left-armer.

McKenzie reached his double hundred off 350 balls, hitting 24 fours and three sixes in the process.

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