Connolly built on her heat performance from yesterday, which was a season’s best of 52.99s. 

“Making the final was my main goal so I'm absolutely ecstatic!” Connolly told Athletics Australia. 

“There's a lot of 52-second runners so I just need to stay relaxed. 

"Everyone wants to compete in the world junior final. I'm just going to give it my all,” she said.

Carley Thomas is through to the final of the 800m after a commanding performance in her semi-final.

The 17 years old crossed the line in first place and in a new personal best 2:03.19.

“I just wanted to go with whatever moves people made," she said

“I was trying to look in my peripheral vision to see if anyone was coming up and I thought it’s now or never,” said Thomas.

She will go into the final as the fourth-fastest qualifier.

Teammate Jemima Russell had a lifetime best of 2.04.81 to finish fifth in the second semi but it wasn’t enough to progress