Tiezzi, a top-10 junior, played on the professional tour in the 1980s and early 1990s. At the
1987 Pan American Games in Indianapolis, Tiezzi won silver medals for Argentina in both the women's doubles and mixed doubles events. She featured once in the singles main draw of a grand slam tournament, as a qualifier at the
1988 French Open. Her best performance on the WTA Tour was a quarter-final appearance at
Guaruja in 1989. ==ITF finals==