Cynthia was co-coach at South Hawthorn from 1996-2010. She played in what she describes as the "Golden Era" of Australian tennis, the 1970's. She was on the international circuit for 9 years, competing in all the Grand Slam events. Cynthia's highest ranking was #15 in the world and #6 in Australia. She played against Billie-Jean King, Evonne Goolagong, Chris Evert and Martina Navratilova. She beat Martina in the semi finals of a tournament in Southern California.
In mixed matches she played against John McEnroe, Bjorn Borge and Vitas Gerulaitis. In John McEnroe's autobiography he mentions a match in his first Grand Slam event, the French Open of 1977. Mary Carillo and McEnroe were cruising through the mixed doubles, "Our roughest match was a three setter in the semis against Tomas Koch of Brazil and Cynthia Doerner of Australia".
Cynthia played an exhibition match in Central Park New York for underpriviged kids with Borge and Gerulaitis who were really good friends.
After her tournament career, Cynthia coached in the USA for 8 years, the last 2 as Head Coach of the Women's Tennis Program at Fresno State University. She returned to Australia and was made coach at South Hawthorn along with Sue Davey in 1996.
Cynthia's two sons both played college tennis in the USA. Scott Doerner played for Pepperdine University in Malibu from 2003-06. Pepperdine won the NCAA Championship in his Senior year. He was made All American in 2005-06 and was ranked as high as #2 in doubles and #14 in singles. He played in the main draw of the Australian Open.Austin Doener was awarded a scholarship to De Paul University in Chicago and played #1 on the team in his Junior and Senior years.
Both Scott and Austin coach at Pepperdine and as they became more settled in the USA, Cynthia decided to move to California in 2011. In her years at South Hawthorn Cynthia was involved in the club as a coach and Comittee member and was made Coach of the Year by Tennis Victoria.