Seventeen-year-old Leah O’Brien has broken the national under-18 100m record held by Australian sprint legend Raelene Boyle for 57 years.

O’Brien won the girls’ final at the Australian Junior Athletics Championships in 11.14 seconds (+1.7 wind resistance), eclipsing Boyle’s 11.20 that she set at the Mexico City Olympic Games in 1968.

To make the moment sweeter for O’Brien, the Perth local pulled it off in front of her friends, family and hometown fans at the WA Athletics Stadium in Floreat.

Straight after the race she was wrapped in a warm embrace by fellow West Australian Jessica Hanney, who finished just off the podium, before the rest of the field joined the celebrations.

“I honestly thought my race in the heats [11.46] was a really good time, I expected to maybe go 11.3 in the final but I’m so happy because I have been working really hard for that,” O’Brien said.

“It’s around the time that the Open girls run which is crazy to be running that still in high school.”

The time equalled Olympic hurdles gold medallist Sally Pearson’s personal best in the 100m flat for fourth-fastest by any Australian woman.

Globally, O’Brien’s 11.14 is the ninth-fastest 100m time by an under-18 runner in history.

She will return on Friday for the national championships where she will test herself against the likes of Australian record holder Torrie Lewis.

“I really look up to the top girls in Australia like Torrie Lewis and Bree [Rizzo]. I’m always watching their Instagram reels and looking at their photos, it just looks so great and inspirational,” O’Brien said.

“A lot of my family and friends are here, this is definitely the most support I have ever had. It’s so great to experience this moment with the people I love and share the happiness.

“I think I have really put my name out there and hopefully I can be in contention for teams in the future.”

Queenslanders Thewbelle Philp and Amaya Mearns rounded out the U18 100m podium behind O’Brien, just as they did in the 200m on Saturday.

In the boys U18 100m, South Australia’s Kelechi Ekwomadu won in 10.40 (+2.8), with Gout Gout’s training partner Jonathan Kasiano second in 10.54 and Oliver Facer claiming bronze in 10.58.