Fretz grew up in
Harrisburg, Pennsylvania and played collegiate tennis at
Occidental College in Los Angeles,
California. She was coached by
Alice Marble. In 1961 she won the singles and doubles titles at the NCAA Intercollegiate Championship. At the U.S. Nationals, she was doubles semifinalist in 1965, and reached the mixed finals at the U.S. Open in 1968. She was runner-up to
Carole Caldwell Graebner at the 1965
Pacific Southwest Championships. At the
Cincinnati Masters, Fretz reached the singles final in 1968 before falling to
Linda Tuero. She also reached the doubles final in 1962 at Cincinnati with Carolyn Rogers. In 1974, she played with
Billie Jean King in the
World Team Tennis on the
Philadelphia Freedoms. She has been inducted into the Intercollegiate Women's Tennis Hall of Fame in 1999. == Grand Slam finals ==