Australian Sally Pearson has thrown down the gauntlet to her competitors by clocking the fastest semi-final time in the 100m hurdles at the world athletics championships in London.
Sally Pearson experienced a host of emotions as she flashed across the finish line in London to claim her sweetest victory. "I'm so exhausted but I'm sure it will sink in soon", she said.
It was the latest instalment of the great rivalry between Pearson and Harper-Nelson, with the American having relegated the Australian into second spot at the 2008 Beijing Olympics, only for Pearson to reverse that result four years later in London.
She missed the last two seasons due to hamstring and Achilles injuries and a badly broken wrist and feared for her career.
Pearson dominated the first of the three semi-finals on Friday evening, winning in 12.53 seconds.
She won in 12.59 seconds, ahead of American Dawn Harper-Nelson in 12.63 and Germany's Pamela Dutkiewicz in 12.72.
"I love this stadium, I love the people and I'm so happy to be back here doing the same thing again". "There were so many big names in the field and since I was a girl I have been admiring Sally Pearson". I had a flow.
Favourite Kendra Harrison, who set the world record in the London Stadium previous year having missed out on Olympic selection, again clattered too many barriers as she did in the semis and finished fourth in 12.74.
After contemplating hanging up the spikes, the 30-year-old qualified fastest for the final and held her nerve to add to her triumph at the 2011 world championships.
"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.
Harrison - who was the 1/6 on favourite for the title and had not been beaten in a race since the US Olympic trials a year ago - at least made it unlike Jamaica's defending champion Danielle Williams who flopped to finish fifth in her semi.