Serena Williams has set a single-season prize money record on the women's tour by earning US$6,545,586 ($9 million) this year, according to the Women's Tennis Association.

The 11-times Grand Slam champion and world No 1 now has career earnings approaching US$30 million.

This season Williams eclipsed the previous record of US$5,429,586 set by Belgian Justine Henin in 2007.