In-form sprinter Bree Rizzo has headlined a big day for Australian athletics in Tokyo, beating American star and reigning world champion Sha’Carri Richardson to take out the 100m.

A month after claiming the Stawell Gift off scratch, Rizzo was among six Australian wins, three meet records and seven podium finishes at the Seiko grand prix.

It was held at the National Stadium, which will host September’s world championships.

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Rizzo, who also finished third last month behind Torrie Lewis in the 100m at the Australian championships, clocked 11.38 seconds to win the 100m in Tokyo, with Richardson finishing fourth.

“Not my best start,” Rizzo said.

“But came back to win my first (Continental Tour) Gold meet!!!!”

Richardson, who backed up her 2023 world championship gold with silver at the Paris Olympics, was in her season opener.

But it is nonetheless the second time an Aussie has upstaged the American star, with Lewis beating her at a Diamond League meeting in China last year.

Rizzo featured in a 16-strong Australian team that made itself at home in Tokyo ahead of the worlds, with Georgia Griffith also posting the fastest outdoor time of the year in the women’s 1500m.

Griffith clocked four minutes 01.10 seconds to also break the 10-year meeting record held by Ethiopian great Gudaf Tsegay.

The Australian won by five seconds, with compatriot Sarah Billings taking third place.

Rose Davies and Jude Thomas dominated the 3000m events, also breaking the meet records.

Davies’ 8:42.38 gave her the women’s race by nearly six seconds, and Thomas improved to 10th on the all-time Australian men’s list with his 7:39.69 win.

Reece Holder won the men’s 400m in 44.76 seconds, and Liam Adcock’s last jump of 8.20m won him the long jump.