Born in Hayward, California. With Rudi Galindo she won the junior pairs title at the U.S. Figure Skating Championships in 1986, 1989 and 1990. In 1988 Yamaguchi won the singles and, with Galindo, the pairs titles at the World Junior Championships. From 1990 Yamaguchi concentrated on singles competition. At the 1992 Winter Olympics she won the singles gold medal. She also won both the 1991 and 1992 world championships.
She established the Always Dream Foundation for children in 1996.
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