Foretz has won seven singles and thirteen doubles titles on the ITF tour in her career. On 24 February 2003, she reached her best singles ranking of world number 62. On 19 May 2008, she peaked at world number 42 in the doubles rankings.
Foretz was an accomplished junior player, having reached the final of the girls' tournament at the 1999 French Open. She was also selected to play for the Boston Lobsters in the 2009 World TeamTennis pro league.
In 2010, Foretz married Benoit Gacon and began competing under the name Stéphanie Foretz Gacon. In 2014; however, she reverted back to her maiden name and now competes as Stéphanie Foretz.