Australia's Sally Pearson bounced back from two years of injury hell to reclaim the 100 metres hurdles world title in London.
Sally Pearson is back and getting another gold medal at the Olympic Stadium in London.
"I don't know if it was surprise or what, but the emotion just escaped my body because I was so excited and so happy to have achieved what I have worked so hard for", Pearson said.
"I'm so exhausted but I'm sure it will sink in soon".
After taking the baton from his teammate Yohan Blake, Bolt began to gather speed only to pull up and shout in pain about 60m from the finish line.
She missed the last two seasons due to hamstring and Achilles injuries and a badly broken wrist and feared for her career.
Harrison had blasted out of the blocks but faded as Pearson arrived on her shoulder and the Australian hurdled to a famous victory.
Hilliard said it was hard to overstate what Pearson had overcome to get back to the top of the world.
"And with these world championships, yes it's a relief to get it done, but I think the last four years, 2013 even I had injuries, so year after year I had that and then to come out here, knowing I haven't been injured, that I'd done everything I possibly can".
Australia's Sally Pearson, left, crosses the line to win gold in the women's 100-meter hurdles final during the World Athletics Championships in London Saturday, Aug. 12, 2017.
Hilliard said he always felt world record-holder Kendra Harrison would be vulnerable in the heat of a championship final, especially once she had stumbled in the semi-final.
"Me and Sally have just battled it out for years and it's been so great to be here with her", said the 33-year-old Harper.
"Silver tastes like gold tonight", she said.
It proved to be masterstroke.
"I can not believe it, it's insane", said Dutkiewicz.
"It took me hours and hours and hours on the first day to write a program out and decide what was best for me and what I could and couldn't do, being an older athlete, having these injury troubles".
The last time Pearson raced at a championships was when she won gold at the 2014 Glasgow Commonwealth Games.
"From the first day I started training I knew it was possible, I knew I could get here and I remember someone saying "you can be the world champion again" and I didn't feel awkward about that".
She parted with her long-term coach from her junior days, Sharon Hannan, after she won silver in Moscow. Fellow American Christina Manning finished narrowly behind the world record holder to take fifth, ahead of 2015 medallist Alina Talay in sixth.