She was in fine form in the under 49kg category as she defeated Russian Mariia Tiumerekova 10-0 by technical fall for gold.

The final victory followed a dominant run to the final which began with a 46-second technical win over European cadet runner-up Zhala Aliyeva of Azerbaijan.

Her first three bouts were all won in just over two minutes, but American Macey Kilty put up more of a fight before Sasaki secured a fall just over three minutes into the semi-final.

Kilty recovered to win bronze, beating Aliyeva, who had come through the repechage system, 13-2.

The second bronze went to Turkey's Zeynep Yetgil who beat Emanuela Liuzzi of Italy 6-2.

Japan also won the under 43kg class as Manami Uneo defeated Russia's Daria Khvostova 10-0 via technical fall for gold.

Reem Magdy Mahmoud Youssef Ahmed of Egypt beat India's Ankush Ankush 5-4 for the first bronze with Aynur Jamalova of Azerbaijan ousting Ana Maria Torres Rubio of Spain 4-2 for the second.

A third Japanese gold came courtesy of Andoriahanako Sawa at under 56kg, after her 6-2 final win over Anastasia Nichita of Moldova.

Bronzes went to Oksana Chudyk of Ukraine, a winner by fall against Krystsina Sazykina of Belarus, and American Grace Marie Figueroa, a 6-5 victor against Russian Anastasia Sizenko.

Indian gold came in the under 38kg category with Manisha Manisha's win over Bulgaria's Petya Zarkova Delcheva, 5-4.

Valeriia Chistobaeva of Russia defeated Azerbaijan's Shahana Nazarova 4-0 for bronze, with Nada Medani Ashour Abdalla Mohamed of Egypt edging Belarus' Tatsiana Blinkouskaya 5-4 for the second. 

In the under 56kg class there was Russian success as Khanum Velieva prevented more Japanese gold by beating Miwa Morikawa 4-2.

Hungary's Tuende Emese Elekes collected the first bronze in the division by defeating American Ashlynn Ortega 2-1.

The second minor medal went to Meerim Zhumanazarova of Kyrgyzstan who won by technical fall against Lithuanian Aukse Rutkauskaite.