|Full name||Daniela Klemenschits|
|Born||13 November 1982|
|Died||9 April 2008 (aged 25)|
|Highest ranking||No. 356 (July 9, 2001)|
|Career titles||23 ITF|
|Highest ranking||No. 95 (August 22, 2005)|
Daniela played doubles with sister Sandra on the WTA Tour and the ITF Women's Circuit. The team dominated doubles tennis in Austria in the mid-2000s, becoming the country's No. 1 team in 2006. She won a total of 23 titles on the ITF level and reached one final on the WTA level. She reached the top 100 of the WTA doubles rankings in 2005. Daniela also represented Austria on the Fed Cup in 2005, where they defeated Switzerland.
Daniela played her final professional match on 14 December 2006, at the tournament in Valasske Mezirici, Czech Republic. She had partnered sister Sandra, losing in round one of doubles against Eva Hrdinova and Stanislava Hrozenska, 5–7, 2–6.
In January 2007, both Klemenschits and her twin were diagnosed with a rare form of abdominal cancer, squamous cell carcinoma, forcing their retirement. Fellow tennis players rallied for Klemenschits and donated money to pay off the removal of several tumours and the expensive medical care required. Daniela died on 9 April 2008 in Salzburg, aged 25. Sandra, however, survived and returned to the doubles tour in July 2008.
- "Former Austrian tennis player Daniela Klemenschits dies of cancer at age 25". Associated Press. International Herald Tribune. 2008-04-09. Retrieved 2008-04-13.