Australia's Sally Pearson has overcome a horrific run of injuries to win in the women's 100m hurdles final at the IAAF World Championships in London.
But none more than sheer pride.
Saturday's final 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.
Favorite Kendra Harrison, who set the world record in the London Stadium past year having missed out on Olympic selection, clattered too many barriers as she did in the semis and finished fourth in 12.74.
She suffered a shattered wrist and had a series of serious calf and Achilles problems as well as hamstring issues that denied her the chance to compete in Rio or the Beijing world championships or her medal haul have could been even greater.
With Olympic gold and silver medals and now two world championship golds and a worlds silver to her name, Pearson stands as the most decorated track athlete and arguably the best overall athlete Australia has produced in the modern era.
Harper-Nelson proved that age is no barrier to success as at 33 she enjoyed a second wind in her career. Germany's Pamela Dutkiewicz finished third in 12.72 seconds.
"I've worked so hard, I don't know what has just happened out there. I'm so exhausted but I'm sure it will sink in soon", Pearson said.
After several seasons wracked by injury, the decision 12 months ago by the hurdler to coach herself won the blessing of those who mattered most, a band of supporters that includes husband Kieran Pearson. I fought, I knew I was in front.
Pearson split acrimoniously from her longtime coach Sharon Hannan after finishing second behind Brianna Rollins at the 2013 world titles.
"I'm so excited right now", Nelson said.
She assumed favouritism for the 2017 world title by clocking the fastest semi-final time of 12.53 on Friday evening and carried that dominance into the final.
"I love this stadium, I love the people and I'm so happy to have been back here doing the same thing again (winning gold)".
On her joyous finish-line exclamations, she said: "I don't know if it was surprise but the emotion just escaped my body because I was so excited and so happy to have achieved what I've worked so hard for".
"Silver tastes like gold tonight", she said.
"It's hard to compare eras, I don't think you can, and it would be stupid of me to do that - Betty Cuthbert was a freak".