Pearson romps into semi-finals

World champion Sally Pearson qualifies for the semi-finals of the 100m hurdles in a time of 12.57 seconds.

Great Britain's Tiffany Porter joins her in qualifying along with Lolo Jones from the USA.

Ireland's Derval O'Rourke finishes fourth in her heat but is likely to go through as a fastest qualifier.

Watch the full session on the BBC Sport Interactive Player.

Available to UK users only.

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