Katherine Hui

Katherine Hui 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.

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.

Awarded a wildcard for the qualifying competition to the 2023 US Open women's singles, Hui lost in the first round to Eugenie Bouchard.
She received a wildcard for the 2024 San Diego Open for her WTA Tour main-draw debut, but lost in the first round to seventh seed Donna Vekić.