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Katherine Hui (Chinese: 辉婧怡; pinyin: Huī Jìngyí; born 29 January 2005) is an American tennis player. She became the girls' singles champion at the 2023 US Open.
Early and personal life
From San Diego, California, Hui graduated from Santa Fe Christian High School in 2023 and committed to Stanford University. Her parents, Yimei and Yan, were born in China before moving to the United States.
Juniors
Hui qualified for the prestigious junior tournament Les Petits As in Tarbes in January 2019. At the tournament, she lost to eventual champion Linda Fruhvirtová in the quarterfinals. Hui and her partner, Kayla Cross from Canada, were the runners-up in doubles.
In 2022, at the Billie Jean King Girls’ 16s and 18s National Championships, Hui reached the semifinals. In 2023, at the Billie Jean King Girls’ 16s and 18s National Championships, she reached the final but was defeated in three sets by Clervie Ngounoue.
Awarded a wildcard into the girls' singles at the 2023 US Open, Hui won the tournament by defeating Tereza Valentová in straight sets. She did not lose a set throughout the tournament.
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Trophies ![]()
Milestones
Former Youth Teams ![]()






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