On February 7, 2000, she became the sixth Frenchwoman after Françoise Dürr, Mary Pierce, Nathalie Tauziat, Amélie Mauresmo and Julie Halard to break into the top 10 in the singles rankings.

This marked the first time France had four women ranked in the singles top 10 simultaneously (Mary Pierce at No.

Her third career-title victory that came in Hawaii over Justine Henin happened in a final that was delayed for a day due to the terrorist attacks on the U.S. on September 11, 2001.

Testud played in the season-ending Tour Championships for five consecutive years from 1997 to 2001; reaching the singles semifinal and doubles quarterfinal in her last appearance in 2001.

She won her second singles match against the host country Netherlands to give France an unassailable 3–1 lead in the 1997 Fed Cup final in Den Bosch.

She also represented her country in the 2004 Olympic Games in Athens, where she lost in the singles first round and reached the doubles QF with Nathalie Dechy.