An underwater view shows Hong Kong's Siobhan Haughey compete to win a semi-final of the women's 100m freestyle swimming event during the Tokyo 2020 Olympic Games at the Tokyo Aquatics Centre in Tokyo on July 29, 2021. (FRANCOIS-XAVIER MARIT / AFP)

Hong Kong swimming star Siobhan Haughey cruised through the women’s 100-m freestyle semifinals at the Tokyo Olympics on Thursday morning, beating her own Asian record set a day earlier.

Haughey finished first in 52.4 while Cate Campbell of Australia came in second in 52.71. The finals are scheduled on Friday morning.

Haughey's latest feat came after she won a silver medal on Wednesday morning in the women’s 200-meter freestyle. This is Hong Kong’s second medal in this year’s Games and its first in Olympic swimming history.

Haughey's mother is from Hong Kong and her father is Irish. Her great uncle Charles Haughey was a former Irish prime minister.

Born in and grew up in Hong Kong, Haughey has shown massive improvement since her Olympic debut in Rio where she made the semis of the event and swam a time of 1:57.56.

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She first won the silver medal in the women's 200m individual medley event in the Summer Youth Olympic Games 2014. In the same year, her teams won bronze medals in the women's 4x100m medley relay and the women's 4x200m freestyle relay in the Asian Games.