Pre-professional

In 1996, she entered at a tournament in Austria in which players like Allison Fisher, Gerda Hofstaetter and Franziska Stark participated and placed 4th place behind these three well established players.^[6] In 1998, she earned a silver medal in eight-ball and a bronze medal in nine-ball at the Youth European Championship. Starting in 1999, she won gold medals in both events every year as a Youth until 2004 except in 2002 when she earned a silver in nine-ball.^[8]

Her first professional competition was the Florida Classic 2002.^[1] In 2002, she had professional earnings of US$1,750 in prize money for taking first place in the 2002 WPBA Amateur Nationals.^[9] In 2005, she had earnings of $1,700.^[10] That year she became the World Games women's nine-ball champion.^[5] She also moved up to the Women's division in the annual European Championships in 2005 and has earned at least one gold medal each year since.^[8]

In 2006, she was ranked sixth among women in the prize money year-end rankings with a total of $36,251 in earnings.^[11][12] That year, she won the May 14—20, 2006 BCA Open Nine-ball Championship women's division,^[13] defeating the UK's Allison Fisher and earning $20,000.^[14] She has competed in what have traditionally been regarded as men's tournaments, especially while participating in the EuroTour.^[5] She placed 5th in the men's World Straight Pool Championship in 2006, which was won by Thorsten Hohmann.^[6] She also finished 3rd in the women's World Pool 10-ball Championship in Manila, Philippines.^[15]

Professional

In 2007, she joined the WPBA.^[1] That year, she was ranked ninth among women in the prize money year-end rankings with a total of $23,000 in earnings.^[16] Her best payday for the year was a second-place finish at the WPBA San Diego Classic for which she earned $8,300.^[17][18] She competed again at the Men's World Straight Pool Championship in 2007 but lost to Warren Kiamco in the last 16 to finish in 9th place.^[6]

In 2008, she was ranked fourth among women in the prize money year-end rankings with a total of $44,059 in earnings.^[19] During the season, she reached the top of the world rankings.^[20][21] Her largest victory that year was the September 14 WPBA Carolina Classic 7–1 win over Jeanette Lee, which earned her $13,500.^[13][22][23] In 2008, she reached the Men's World Straight Pool Championship semifinal by beating Mika Immonen and defending champion Oliver Ortmann, but then lost against Francisco Bustamante. However, her third-place finish resulted in the first medal won by any woman in an open world pool championship.^[24]

In April 2009, she won the European Championship eight-ball competition.^[25] She was also the world's top-ranked woman in early 2009.^[26] On June 21, 2009, she earned $12,700 for winning the WPBA Great Lakes Classic.^[7][27] On July 25, she earned a silver medal after losing to Allison Fisher at the 2009 World Games.^[28][29] Ouschan also won the October 14–18, 2009 WPBA Pacific Coast Classic and the November 11–15, 2009 WPBA Nationals.^[30][31] She finished third among women in 2009 with earnings of $58,578.^[32]

In the March 2010, European Pool Championships she swept all four disciplines, including the newly contested ten-ball. First in straight pool she defeated fellow Austrian Gerda Hofstätter.^[33] Then in ten-ball, she defeated German Ina Jentschura.^[34] Next, she defeated Norwegian Line Kjorsvik in eight-ball.^[35] Finally, she defeated Hofstatter again in the nine-ball championship.^[36] She became the first woman to win more than two gold medals in a single competition.^[4] In October in Manila, Philippines, she won the Yalin Women's World 10-ball championship.^[37][38] During the year, she also won the WPBA September 23–26, 2010 Atlanta Classic held in Atlanta, Georgia.^[39] Her 2010 total of $41,391 ranked second among women.^[40]

In January 2011, she won the WPBA Masters by defeating Karen Corr at Mount Pleasant, Michigan for a prize of $7,500.00.^[41] At the 2011 European Pool Championships, she won gold medals in straight pool, ten-ball and nine-ball, but did not medal in eight-ball. On March 26, she defeated Kjorsvik for the straight pool title 75–31.^[42] Then, on April 1, she defeated Hofstatter, 7–2 in nine-ball.^[43] On April 2, she defeated Nataliya Seroshtan 6–1 in ten-ball.^[44] Her 2011 total of $31,300 ranked eighth among women.^[45]

Her 2012 total of $30,470 ranked fifth among women.^[46] At the European Championships, she won gold at the 10-ball competition,^[47] and she placed in bronze in the other three individual events as well as the team competition.^{[48][49][50][51]}

Her 2013 total of $26,048 ranked eighth among women.^[52] At the European Championships, she won gold at both the straight pool and the 9-ball competitions,^[53][54] and she placed in bronze in the other two individual events as well as the team competition.^[55][56][57]

In 2021, she was ranked the 17th best woman billiard player in the world by the Women's Professional Billiard Association.^[58]