Celeste Mucci and Camryn Newton-Smith started the final day of the heptathlon in the long jump and javelin.

Mucci, who started the day in fourth, jumped to 6.13m and remained within sight of the podium before finding a personal best in the javelin, her weakest event, with a throw of 43.03m to put her into third.

Teammate Newton-Smith looked to improve from day two and started well with 5.66m jump then a personal best of 44.87m in the javelin as she moved up the table.

It came down to the final event, whether Mucci would hold onto a bronze medal but she needed to hold off Adriana Rodriguez and Adrianna Sulek.

Mucci tried to close the gap created and hold on to the bronze, but Rodriguez and Sulek were too strong as Mucci had to settle for fifth, which is the best finish by an Australian at the World U20s. 

Newton-Smith finished her heptathlon with a new personal best in the 800m of 2:23.11 and brought her total to a lifetime best score of 5487 to place equal 14th. 

Mia Gross and Riley Day were back on the track for the 200m heats with both automatically progressing to the semi-finals.

The last time Australia had a finalist in this event was back in 2000 and unfortunately it looked like that would continue.

Day had to pull out of the semi-finals due to hamstring trouble but Gross, although she didn't qualify for the final, said she had the best run of her life.

“That was amazing. I came off the bend and it was the best bend I have ever run in my life,” Gross told Athletics Australia.

“I am super stoked. I haven’t run that quick in a long time. If conditions were alright I reckon that would have been a PB,” she said.

Gross finished 12th overall with a time of 23.86.

In the 100m hurdles heats, Lateisha Willis and Samantha Johnson did enough to qualify for the semi-finals.

Willis dipped on the line to grab third place and secure automatic qualification with a time of 13.92 seconds while Johnson finished fifth in her heat but her time of 13.97s was enough to go through. 

There will be no Australian women in the 1500m with both Sarah Eckel and Abbey Caldwell were unable to qualify.

Eckel, whos heat had a slow start, finished seventh in 4:24.90 as Caldwell found herself in the heat with a quicker pace but unfortunately started to drift and with one lap to go was out of contention. 

“It’s been a really good experience so far. It was pretty crazy out there today like nothing I had ever experienced before. It’s a good learning experience,” said Eckel.

“At the start of the race it was quite physical because it was a fast start, for the first 100m it was quite pushy," Caldwell said.

"We were all lucky to stay on our feet.”

Steeplechasers Montanna McAvoy and Brielle Erbacher closed their campaign placing 13th (10:06.37) and 15th (10:16.84) in a fast 3000m steeplechase final. Kenyan Celliphine Chepteek Chespol won goal in a championship record time of 9:12.78.

In the 4x100m qualification, Australia were in heat 1 with a team of Nana Owusu-Afriyie, Kristie Edwards, Samantha Johnson and Grace Brennan. Australia needed to place in top three or be one of the next two fastest qualifiers to progress.

Brennan crossed the line after running past the Americans who dropped the baton in the final change but Australia had to watch heat 2 to see if they would qualify.

Ireland took the win in 44.27 while Jamaica were disqualified and it looked like Australia had missed until a crazy turn of events saw China disqualified. Australia has made the final for Saturday night.

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