Chinese Taipei's Hsin-han Chou was the first to top a podium as he triumphed in the men's under-148-centimetres category at the Arena Hotel Hills in Bosnia and Herzegovina's capital city.

He got the better of Turkey's Utku Kap in the final after neutral athlete Shamil Pakhrudinov and South Korean Kwon Min-sung claimed the bronze medals due to semi-final defeats.

The divisions are primarily based on a maximum height but also have a minimum height as well as upper and lower limits for the athletes' weight.

Uzbekistan's Islombek Akhchurin was the next champion as he prevailed in the men's under-152cm gold medal-match against Italian Francesco Cutrone.

Chen-Syuan Wu sealed another medal for Chinese Taipei as he shared the third step of the podium with Kazakh Dinmukhammed Tolybai.

South Korean Lee Geun-mi became the first female champion of the event with a win in the women's under-144cm decider.

Nazerke Zhanabergen had to settle for silver while Jordanian Safaa Eneizat and Hilal Ayar of Turkey picked up bronzes.

Virginia Lampis of Italy was the first European gold medallist of the day thanks to her victory in the women's under-148cm final against Germany's Maria Koukousoudi.

Yi-hsuan Xia claimed bronze for Chinese Taipei alongside Greek athlete Paraskevi Kalogirou.

Petra Uglešić of Croatia was the fifth winner on day one courtesy of a women's under-152cm victory against Han-fei Wang of Chinese Taipei.

World Taekwondo has partnered with the International Testing Agency (ITA) for the Championships.

ITA education ambassador Thais Cevada will be on site at an information booth in the warm-up area for the duration of the event.

She will be available to answer any questions from athletes regarding the doping control process and how to avoid committing an anti-doping rule violation.