Here's a 15-year-old matching it with the top sprinters in the squad, the teenager never taking a session off even as those around her waver.

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That's no small feat given Fabri trains some of Sydney's elite sportspeople, the likes of Sonny Bill Williams, David Warner and Josh Addo-Carr having passed through his squad over the years.

Despite the aura those athletes maintain, Amidzovski has never taken a backwards step.

It's a mindset that has seen the Albion Park hurdler develop into one of Australian athletics' brightest prospects and it didn't take long for Fabri to identify what sets her apart from her rivals.

"The thing about Delta is there's no off day," Fabri said. "I don't see another version of her except for the A-plus version every session.

"Many in the squad who perform at a high level have off days. It's difficult to have the ability to find that every session. If every session is worth $100, Delta gets $100 out of it. I don't get any short sessions, she gives maximum value every session."

Amidzovski is preparing for a new challenge, having been named in the team to compete at the World Under-20 Athletics Championships in August.

Such is her youth, the teenager needed special permission from Athletics Australia just to nominate for selection.

That became a formality when she blitzed her rivals in the under-20 100m hurdles final at the recent Australian Championships.

While travelling to Colombia to take on athletes four years her senior would be daunting for many, Amidzovski won't be intimated.

That's just another day at the track.

"What she's done is Herculean," Fabri said. "At 15 she's taken on the opens, dusted them up. She's come back to her own age and treated them with arrogance. Now she's on the Australian team as the youngest member and is going to represent her country.

"She'll learn plenty of lessons when she goes over there. She'll find out what it takes to be No. 1 in the world."

Amidzovski has long dominated the track-and-field scene, the youngster a star across multiple disciplines.

In primary school she was winning state and national titles in long jump, high jump, sprint and hurdle events and that form has translated to her teenage years.

The World Junior Championships will present a new challenge, an opportunity to test herself against athletes far more talented than any in this country.

Amidzovski recognises it will be a learning experience and while a medal shapes as an aspirational target, she's simply focused on producing her best when the stakes are high.

"I'm focused on doing my best," Amidzovski said. "If my preparation is good, I'll know I've prepared and I can only hope for success.

"The first goal is to get out of the heats to the semi, and then get through to the final after that."

With Amidzovski already among Australia's fastest 100m hurdlers, Fabri makes no secrets about how good his athlete can be.

"Sally Pearson is the benchmark," Fabri said. "That's what we've got to follow. She delivered on the world stage and did really well athletically.

"Delta can be No. 1 in the world. She's already breaking records of people who went on to become No. 1 in the world."

Fabri, however, knows how tough it is to make it to the top of world sport.

Amidzovski clearly possesses the talent to get there, but success is about more than just raw ability.

So far, the teenager has shown she has the passion, commitment and dedication to achieve her goals, but Fabri knows that can change in an instant.

He's seen it time and time again, teenage stars who decide the sacrifices aren't worth it.

Amidzovski, he hopes, will be the one who comes to the opposite conclusion - who decides it's all worth it to ensure one day she's lining up for an Olympic final.

"It goes back to one word," Fabri said. "Discipline. That's the most important ingredient. She has that discipline. I've been nervous as she's become a teenager, but so far she's given me no indication there's any chinks in her armour.

"You have to have sacrifices. If she's willing to do it, she has the ability. The world's in her hands, we'll see if life gets in the way or not."

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