In the 15 years of her career from 1989 to 2004 she was one of the best German players. She went to 29 times for the German Fed Cup team, even the Federation Cup victory in 1992 with Steffi Graf and Anke Huber. On 1 February 1993 she reached position 24 of their best ranking in the WTA world rankings.
Rittner won two WTA singles tournaments in 1992, the warm-up tournament for the U.S. Open in Schenectady and 2001 clay court tournament in Antwerp. According WTA she now holds the record for the longest period of time between two tournament victories. She stood three more times in the finals of a WTA tournament and also won three doubles titles. In her career she has twice reached the second round of a Grand Slam tournament: at the 1996 French Open, when she beat local favorite Mary Pierce and Others, as well as at the 2001 Australian Open.
Among its successes is also a Wimbledon title in the junior women 's singles in 1991. Rittner Barbara was regularly active for the tennis Bundesliga TC Benrath in Dusseldorf.
Their last single on the tour played Rittner 2004 in the second qualifying round of the U.S. Open, where she defeated than 176 of the world rankings the Frenchwoman Severine Bremond in two sets. In 2005, she even went on to two double tournaments before she ended her career final.