San Diego's Katherine Hui wins US Open girls' title as unseeded wildcard

Hui, 18, tops Valentova 6-4, 6-4 for junior grand slam title San Diego native starts first year at Stanford in nine days Brazil's João Fonseca wins boys' title over Learner Tien Katherine Hui made it two big victories for American teenagers at the US Open on Saturday, winning the girls' title as an unseeded wildcard in only her second junior grand slam appearance. Hui, an 18-year-old from San Diego who is entering her freshman year at Stanford, stepped on to Court 12 for her final during 19-yea...