| Tanja Ostertag | |
| Birth Date: | 26 September 1987 |
| Plays: | Right-handed |
| Careerprizemoney: | $41,914 |
| Singlesrecord: | 117–109 |
| Singlestitles: | 2 ITF |
| Highestsinglesranking: | No. 287 (20 November 2006) |
| Doublesrecord: | 7–8 |
| Highestdoublesranking: | No. 876 (16 May 2005) |
Tanja Ostertag (born 26 September 1987) is a German former professional tennis player.
A native of Stuttgart, Ostertag reached a career high ranking of 287 while competing on the professional tour.[1]
Ostertag won two titles on the ITF Women's Circuit, both in Switzerland, and in 2006 had a win over world number 75 Kaia Kanepi at a tournament in Prostejov, which is the highest ranked opponent she defeated on tour.[2]
In Quebec in 2006 she qualified for her only WTA Tour main draw, winning her first round match over Raluca Olaru at the Challenge Bell tournament, before being eliminated in the second round by Olga Puchkova.[3]
| Legend | |
|---|---|
| $25,000 tournaments | |
| $10,000 tournaments |
| Outcome | No. | Date | Tournament | Surface | Opponent | Score | |
|---|---|---|---|---|---|---|---|
| Runner-up | 1. | 1 August 2004 | ITF Bad Saulgau, Germany | Clay | Gréta Arn | 4–6, 2–6 | |
| Winner | 1. | 11 September 2005 | ITF Vessy, Switzerland | Clay |  Stéphanie Rizzi | 6–4, 7–6(17) | |
| Runner-up | 2. | 28 October 2007 | ITF Augusta, United States | Hard |  Alisa Kleybanova | 2–6, 1–6 | |
| Winner | 2. | 20 June 2010 | ITF Lenzerheide, Switzerland | Clay | Daria Salnikova | 3–6, 7–6(7), 7–6(4) |