Sun Jiajun (born 1 August 2000) is a Chinese

swimmer Swimming is an individual or team racing sport that requires the use of one's entire body to move through water. The sport takes place in pools or open water (e.g., in a sea or lake). Competitive swimming is one of the most popular Olympic ...

. He won the gold medal in the boys' 100-metre breaststroke and 4 × 100-metre mixed medley relay events at the

2018 Summer Youth Olympics The 2018 Summer Youth Olympics ( es, Juegos Olímpicos de la Juventud de 2018), officially known as the III Summer Youth Olympic Games, and commonly known as Buenos Aires 2018, were an international sports, cultural, and educational event held ...

held in

Buenos Aires Buenos Aires ( or ; ), officially the Autonomous City of Buenos Aires ( es, link=no, Ciudad Autónoma de Buenos Aires), is the capital and primate city of Argentina. The city is located on the western shore of the Río de la Plata, on South ...

, Argentina. He also won the silver medal in the boys' 50-metre breaststroke and 4 × 100-metre medley relay categories in the same event. In 2021, he qualified to represent China in the men's 4 × 100-metre medley relay event at the

2020 Summer Olympics The , officially the and also known as , was an international multi-sport event held from 23 July to 8 August 2021 in Tokyo, Japan, with some preliminary events that began on 21 July. Tokyo was selected as the host city during the ...

held in Tokyo, Japan.

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* 2000 births Living people Chinese male breaststroke swimmers People from Yichang Swimmers at the 2018 Summer Youth Olympics Youth Olympic gold medalists for China Swimmers at the 2020 Summer Olympics Olympic swimmers for China 21st-century Chinese people Swimmers at the 2018 Asian Games World Aquatics Championships medalists in swimming Asian Games gold medalists for China Asian Games silver medalists for China Asian Games medalists in swimming Medalists at the 2022 Asian Games {{PRChina-swimming-bio-stub