Team GB's Jessica Ennis broke the British record and smashed her personal best with a run of 12.54 in the hurdles.
The 26-year-old took 0.25 off her PB and 0.02 off the previous national record set by hurdles specialist Tiffany Porter, while it was also the fastest ever hurdles time recorded in a Heptathlon.
That gave Ennis an 11-point lead over Canada's Jessica Zelinka - whose own time of 12.65 was an impressive PB - which became a total of 2,249 and 25-point lead over the USA's Hyleas Fountain after the high jump.
