Katherine Hui, Joao Fonseca win US Open junior singles titles

Katherine Hui made it two big victories for American teenagers at the U.S. Open on Saturday, winning the junior title. Hui, an 18-year-old from San Diego who is entering her freshman year at Stanford, took the court for her final during 19-year-old Coco Gauff's victory over Aryna Sabalenka for the women's title. Hui then beat No. 9 seed Tereza Valentova of the Czech Republic 6-4, 6-4.

Katherine Hui, Joao Fonseca win US Open junior singles titles

Katherine Hui, Joao Fonseca win US Open junior singles titles

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Tennis – NBC 7 San Diego

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Qualifier to champion: Britain's Raducanu, 18, wins US Open

Katherine Hui, Joao Fonseca win US Open junior singles titles

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Tennis – NBC 6 South Florida