The most remarkable moment of her career was her first-round match at the 2003 Australian Open when she defeated there the defending champion Jennifer Capriati.

Her best Grand Slam tournament showings were two fourth-round appearances, the first in Melbourne 2002, the latter at the 2004 French Open.

[1] In 2004, she also reached her only WTA Tour final in Bali which she lost in straight sets to Svetlana Kuznetsova.

Weingärtner retired after the 2005 US Open, after suffering several first-round losses due to ongoing physical problems.

[2] She made a brief return in July 2008 to play the doubles event of the Gastein Ladies tournament where she partnered Sandra Klemenschits, losing in the quarterfinals to Xu Yifan and Zhang Shuai.